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The 365 Days of Astronomy
The 365 Days of Astronomy podcast launched in 2009 as part of the International Year of Astronomy. This community podcast continues to bring you day after day of content across the years. Everyday, a new voice, helping you see the universe we share in a new way. This show is managed by Avivah Yamani, edited by Richard Drumm. This podcast is funded through Patreon.com/CosmoQuestX and produced out of the Planetary Science Institute.
- 4313 - Astronomy Cast Ep. 807: Mission Tech Series: Ion Drives
https://www.youtube.com/watch?v=NUAmf_p-FKU
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Streamed live on Oct 27, 2026.
The majority of rockets use a chemical propulsion system, but there are other ideas, fancy ideas that sound like they came from science fiction. But they're real and they work! Today we'll talk about ion engines, used by tie fighters everywhere!
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
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Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
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------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Mon, 02 Nov 2026 - 32min - 4312 - Travelers in the Night Eps. 389 & 390 Rose Rules Again & Meteor Whispers
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From May, 2026.
Today's 2 topics:
- Recently my Catalina Sky Survey teammate Rose Matheny discovered 8 new Earth approaching object candidates on a single night with our Schmidt telescope on Mt. Bigelow, Arizona. One of them, 2017 YO is a mile and a half diameter, main belt asteroid, while the other 7 are interesting Earth approaching objects. Another one of Rose's single night discoveries is 2017 YM1. When Rose first spotted it this space rock was moving rapidly north, at 6.9 miles per second, away from the Earth in the constellation of Ursae Major. About 5 days earlier it had passed near both the Earth and Our Moon at which time it was too far south to be seen from Arizona.
- Often observers report hearing a percussive sound, like a sonic boom from an aircraft, minutes after viewing a bright meteor fireball. In addition, in a fewer number of instances, there are many reliable reports of observers hearing popping, hissing, and rustling sounds at the same time they are observing a very bright meteor traveling though the night sky. Professional astronomers have long dismissed these reports saying that what these people hear simultaneously with their visual observations cannot be due to to sound traveling from the meteors path since sound travels 800,000 times slower than light and would take 1.5 to 4 minutes to traverse the distance that the light does in a tiny fraction of a second.
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sun, 01 Nov 2026 - 06min - 4311 - Guide To Space - Space Bites: Phobos or Bust! & "Impossible" Green Stars Are In Fact Real
https://www.youtube.com/watch?v=B9P_8oZ4rCA
Hosted and recorded by: Fraser Cain (@frasercain)
From Oct 23, 2026.
The Japanese mission is off to Phobos. Heck, to Deimos too! And, actually, there are green stars. Lots of colors to choose from! You want purple? We got purple!
Also: Dark matter interacts with dark matter, a mysterious Martian cloud, Euclid discovers a comet, the Milky Way's disc, a mini-mini quasar, NGC 7129 & Seagull nebula (SH 2-292) photos, Patreon question answered!
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
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Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sat, 31 Oct 2026 - 27min - 4310 - EVSN - Exposed Planetary Core Discovered & LIGO Reveals "Spooky Popcorn"
Hosted by: Dr. Pamela L. Gay (@CosmoQuest)
From July 2, 2020.
Join us today as we talk about the first exposed planetary core ever discovered. We examine research that neutrinos may come from supermassive black holes. We look at the filaments found in the halo of galaxy cluster Abell 2255. And we find out that LIGO's mirrors can vibrate due to quantum noise.
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Fri, 30 Oct 2026 - 51min - 4309 - Space Stories - Let's Look at the Weirdest Corners of Space!
https://www.youtube.com/live/H0qVigc9gnQ
Hosted by: Dr. Pamela L. Gay (@CosmoQuest)
Book Talk with Dr. Kimberly K. Arcand & Megan Watzke.
Streamed live on Feb 6, 2026.
When some of our favorite people have a new book on one of our favorite topics, you know we have to have them on! We are super pleased to be joined by Dr. Kimberly K. Arcand and Megan Watzke who discuss their new book "Why Space Will Freak You Out" (Amazon Affiliate Link: https://amzn.to/4rzGtXw ). This colorful book, which mixes illustrations and observations of our Universe, launches February 10. Join us to learn how they picked their targets, and why you should and should not fear our universe.
We are grateful for your support on Patreon.com/CosmoQuestX
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Thu, 29 Oct 2026 - 51min - 4308 - Space Stories - Astronomy Words: Metal
Written & hosted by our Director, Avivah Yamani.
Why do astronomers call oxygen and carbon metals? Explore how stars created the elements that formed planets, and eventually, us!
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Wed, 28 Oct 2026 - 06min - 4307 - Cheap Astronomy - Dear CA #142: Knowns & Unknowns
Hosted by Steve Nerlich.
Who knew?
Dear Cheap Astronomy – Do gravitons exist?
Once again we're dealing with something hypothetical here – so much like virtual particle pairs that pop out of nowhere and can evaporate black holes, it's entirely possible that gravitons exist, but at this time it's probably appropriate to entertain the notion that they might not exist either. Ten years ago we would have said the same thing about the Higgs boson, but that was positively identified by the Large Hadron Collider in 2012 and hence moved from being a hypothetical to a real particle at that time.
Dear Cheap Astronomy – Is the Universe full of explosions?
Well, yes it does seem that way. There are the various classes of novae, but also bursts of various kinds, ranging from radio to gamma ray bursts. They've traditionally been classified separately although the boundaries of those classifications often blur. The word nova means new – arising from the fact that when they happen a star may become visible due to a sudden transient brightening. A standard nova arises from binary systems in which one star is a white dwarf that gravitationally draws material off its binary companion star which is a red giant.
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Tue, 27 Oct 2026 - 14min - 4306 - Astronomy Cast Ep. 806: Mission Tech Series: Thrusters
https://www.youtube.com/watch?v=rK6w8ZHm8UM
Streamed live 18 Oct 2026.
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Today we continue looking at space exploration technologies. This time we will examine thrusters, which can reorient a spacecraft and help it maneuver in space. Maximum flexibility but you need to bring along some propellant.
Smarter Every Day's YouTube video:
I Was SCARED To Say This To NASA... (But I said it anyway)
https://www.youtube.com/watch?v=OoJsPvmFixU
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Mon, 26 Oct 2026 - 30min - 4305 - Travelers in the Night Eps. 387 & 388: Long Winter Nights & Greg's Comet
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From May 2026.
Today's 2 topics:
- Winter nights can be exhausting, productive, as well as sometimes frustrating for asteroid hunters. At the Sixty Inch Telescope on Mt. Lemmon, Arizona, near winter solstice, the night's observing starts at 6:30 PM and continues till after 6 AM which combined with start up and end tasks makes the asteroid hunter's work "day" more than 13 hours long. On such a recent long winter work night, my Catalina Sky Survey Teammate, Carson Fuls discovered an impressing total of 18 new Earth approaching objects. On the other hand on the next 3 night shift, I was treated to one night which was clear followed by two nights which were dominated by the first big snow storm of the season. The best nights are clear, cold, and calm with asteroid images which are small intense points of light. Such a night is said to have good seeing.
- My Catalina Sky Survey teammate Greg Leonard was searching for Earth approaching objects with our 60 inch telescope on Mt. Lemmon, Arizona when he discovered an interesting new comet moving through the constellation of Leo. After Greg posted his discovery observations on the Minor Planet Center's Near Earth Confirmation Page it was observed over the next 3 weeks by 10 different observatories around the world. These data were used to calculate the details of the new object's 51 year path around the Sun and give it the name Comet C/2017 W2 (Leonard).
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sun, 25 Oct 2026 - 06min - 4304 - Guide To Space - What Happens When Black Holes Collide? Black Hole Mergers Across The Universe
https://www.youtube.com/watch?v=vvSNWnHZpjc
Hosted by: Fraser Cain (@frasercain)
From Oct 4, 2016.
Black holes are the most impressive objects in the Universe, but when happens when they crash into each other is absolutely mind-bending. They distort space and time itself, sending ripples out into the Universe.
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sat, 24 Oct 2026 - 07min - 4303 - EVSN - Repainted Rose, Worlds Colliding & White Dwarfs of Unusual Size
From October 21, 2026.
Hosted by Dr. Pamela L. Gay (@CosmoQuest)
This week we look at the weird results in space science. From looking at how wildly different images from different IR telescopes can be colorized, to worlds colliding, to white dwarfs of unusual size, and even to Earth's crust on the move, the news was surprising and sometimes a tad bit horrifying. And we present all of it here.
NGC 7129 — The Flower Bud Nebula. Spitzer vs. Webb color palettes:
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Fri, 23 Oct 2026 - 36min - 4302 - Cheap Astronomy - Dear CA #141: Sorting The Universe
Hosted by Steve Nerlich.
A podcast of sorts… Cheap Astronomy gets organized!
Dear Cheap Astronomy – How are asteroids organized?
The large majority of asteroids in the solar system are in the asteroid belt between mars and Jupiter. There are maybe 1-2 million that are more than a kilometer in diameter and millions more that are smaller than that. Nonetheless there's a huge amount of space between mars and Jupiter so it's nothing like that bit in the Empire strikes back. If you stood one asteroid is unlikely you'd be able to see another one and the odds of successfully navigating it are about one to one.
Dear Cheap Astronomy – Are primordial black holes dark matter candidates?
Well yes, though they aren't only candidates around. To recap, a primordial black hole is a hypothetical object which originated in very primordial times – probably within the first second of the Universe. It is somewhat puzzling that when the Big Bang brought lots of mass-generating particles into existence within a very small volume and at an extremely high density, it didn't form a black hole then and there – which would have then been the end of the story. But not only did things with mass suddenly come to be, they were all flung outwards as well – though primarily moving within rapidly expanding spacetime rather than actually being flung. And so here we are.
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Thu, 22 Oct 2026 - 14min - 4301 - Awesome Astronomy - The Nancy Grace Roman Space Telescope
October Part 2.
Paul Hill and Dr. Jenifer "Dr. Dust" Millard host.
Damien Phillips, John Wildridge and Dustin Ruoff produce.
Jeni gives us the low down on the Nancy Grace Roman Space Telescope in the first talk of Fall AstroCamp 2026.
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Wed, 21 Oct 2026 - 1h 14min - 4300 - Ask A Spaceman Ep. 282: What Happens When You Shine a Light on Nothing?
Light Up Empty Space!
Hosted by Dr. Paul M. Sutter.
How does the vacuum interact with light? Is it possible to use light to create something from nothing? And is "birefringence" a real word? I discuss these questions and more in today's Ask a Spaceman!
Support the show: http://www.patreon.com/pmsutter
All episodes: http://www.AskASpaceman.com
Watch on YouTube: http://www.youtube.com/PaulMSutter
Read a book: https://www.pmsutter.com/books
Keep those questions about space, science, astronomy, astrophysics, physics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE!
Big thanks to my top Patreon supporters this month: Justin G, Chris L, Alberto M, Corey D, Michael P, Naila, Sam R, Joshua, Scott M, Rob H, Scott M, Louis M, John W, Alexis, Gilbert M, Rob W, Jessica M, Jules R, Jim L, David S, Scott R, Heather, Mike S, Pete H, Steve S, Lisa R, Kevin B, Aileen G, Michael J, Phillip L, Steven B, Mark R, Alan B, Craig B, Richard K, Joe R, David P, Justin, Tracy F, Thomas K, James C, Syamkumar M, Mark D, Bruce A, Tim Z, Linda C, The Tired Jedi, Bob C, Stephen A, James R, Allen E, Michael S, Sheryl, David W, Chris, Michael S, Erlend A, James D, Karl W, Edward K, Scott K, Vivek D, M0PPET, Brad, Azra K, Steve R, M D Malahy, Brian O, Alonna M, Joseph B, Anders J, Blaine, Ry Guy, and Phil!
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Tue, 20 Oct 2026 - 23min - 4299 - Astronomy Cast Ep. 805: Mission Tech Series - Gyroscopes & Servos
https://www.youtube.com/watch?v=mcn6f_PE14o
Spinney things!
Streamed live 18 Oct 2026.
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Our journey through space exploration technology continues! Today we look at the things that spin: gyros, reaction wheels, servos. Newton's laws are large and in charge today as spinning has a very useful benefit when you're in weightlessness! Today we are going to understand the nemesis of space exploration missions everywhere, get to the bottom of this, how these things works, why they fail, and maybe what's being done about it, or maybe not!
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Mon, 19 Oct 2026 - 34min - 4298 - Travelers in the Night Eps. 385 & 386: New Aten & Silent ET
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From April 2026.
Today's 2 topics:
- Recently my Catalina Sky Survey teammates Carson Fuls and Greg Lenoard discovered an Aten asteroid which orbits the Sun once every 272 days and on a path that crosses the orbits of Venus and Earth a number of times each year. Atens account for only about 6% of the Earth approaching asteroids that asteroid hunters discover. They are relatively dim and difficult to discover because they spend most of their time inside the Earth's orbit with their sunlit side facing away from us. For example Carson and Greg's newly discovered asteroid, 2017 WJ16, is bright enough for asteroid hunters to track for only about 50 nights every couple of years.
- Oumuamua is the asteroid that zipped by the Earth on a trajectory that started beyond our solar system in truly deep space. After rounding our Sun at 97,000 mi/hr this unusual space rock will continue onward into deep interstellar space. The fact that this reddish object's brightness changes by a factor of 10 every 7.3 hours has been interpreted as being due to an elongated rocket or cigar shape which reflects different amounts of sun light in our direction as it tumbles through space. This strange space rock appears to be about 730 feet long and about 100 feet wide.
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sun, 18 Oct 2026 - 06min - 4297 - AstroMan - G Is For Galileo
Galileo turned the telescope skyward and transformed astronomy, revealing lunar mountains, sunspots, Jupiter's moons, and a Universe far larger than imagined.
"ASTROMAN: the Dark Sky Guardian" is a podcast channel that aims to explore popular science in multiple disciplines and research on interdisciplinary approaches, such as sustainability, dark-sky protection, astrophotography, space exploration, astronomy innovation, inclusive science communication, and STEAM Education by integrating science and arts.
Exodus Chun-Long Sit, also known as the ASTROMAN, is a transmedia astronomy educator, popular science author, STEAM educator, and science communicator in Hong Kong. He is recently the National Astronomy Education Coordinator (Chair of Hong Kong, China) of the International Astronomical Union and President of Starrix. He was also an International Committee Member of the Dark Sky International, regularly organizing public lectures at the Hong Kong Space Museum and the Hong Kong Science Museum. He was also the author of a popular science book "Decoding the Starry Night: A Guide to Stargazing and Astrophotography".
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sat, 17 Oct 2026 - 11min - 4296 - Actual Astronomy - Saturn at Opposition
Hosted by Chris Beckett & Shane Ludtke, two amateur astronomers in Saskatchewan who enjoy teaching astronomy classes and showing the public views through their telescopes. actualastronomy@gmail.com
In this episode, we cover key visual observing highlights for Saturn, including prominent features like the Equatorial Band and Equatorial Zone visible in amateur telescope. We also look at historical transient phenomena, such as the massive, planet-encircling "Great White Spots" that erupt in the northern hemisphere roughly once every Saturnian year.
Alexio wrote:
Hi Chris and Shane,
I saw Saturn in your Observer's Calendar show notes. I'm an amateur astronomer in Mississauga, and thought you might enjoy a website I've built called Astrochron. Its Saturn model lets you move through past and future years and watch the rings open wide, narrow to almost edge-on, then open up again with the other face in view.
Here's Saturn:
https://astrochron.app/objects/saturn
Regards,
Alexio
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Fri, 16 Oct 2026 - 49min - 4295 - EVSN - Luminous Kilonova Challenges Gamma-ray Burst Theories
From November 2020.
The brightest kilonova ever was detected and challenges current gamma-ray burst models. Plus, the history of water on both Venus and Mars, how radioactive elements may help habitability, and a little-known mass extinction event here on Earth. But wait! There's more… new images of the Perseus Cluster, a recaptured 1960s rocket booster, the shortest measurement of time, a treasure trove of copies of Principia, and SpaceX is certified to launch Crew-1 this weekend.
Perseus Cluster pix:
https://www.sci.news/astronomy/perseus-galaxy-cluster-radio-map-09213.html#google_vignette
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Thu, 15 Oct 2026 - 21min - 4294 - Guide To Space - Universe Today News: NASA Selects GIMLI to Search the Marius Lunar Pit for a Potential Lunar Base Site
Recorded by our editor, Richard Drumm.
Written by Matthew Williams.
Lava tubes on the Moon and Mars are some of the most fascinating and useful places we could explore. These are natural tunnels below the surface that could protect astronauts from radiation, provide a constant temperature, and could even be sealed off as a place for a habitat. Now, a new mission is under development called GIMLI that could use ground-penetrating radar to scan beneath the surface and map out the extent of a lunar cave network.
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Wed, 14 Oct 2026 - 08min - 4293 - Awesome Astronomy - Extra: The Hubble Tuning Fork & Citizen Science
Paul Hill hosts solo!
Damien Phillips, John Wildridge and Dustin Ruoff produce.
In this podcast extra episode we talk to Dr. Karen Masters, Associate Professor of Physics and Astronomy at Haverford College, Pennsylvania about The Hubble Tuning Fork and Galaxy classification. But it's not only about that canonized galaxy classification system, it's also about how citizen science – astronomy done by absolutely anybody from their homes – can and does change the accepted wisdom and advance science.
Galaxy Zoo:
Twelve Years of Galaxy Zoo:
https://arxiv.org/pdf/1910.08177
Morphological Classification of Galaxies:
https://arxiv.org/pdf/2502.09610
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Tue, 13 Oct 2026 - 18min - 4292 - Astronomy Cast Ep. 804: Mission Tech Series: Fairings, Docking & Airlocks
https://www.youtube.com/watch?v=GhkGOIAhBWc
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Streamed live on Oct 3, 2026.
Mission Tech Part 3.
Instead of sending up an entire space station for every mission, you can just send up a tiny can filled with astronauts. But that takes docking. And today we're gonna talk about what it takes to connect two spacecraft together. How to keep a cargo safe to get into orbit, and how to get in and out of your spacecraft without killing everyone!
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Mon, 12 Oct 2026 - 31min - 4291 - Travelers in the Night Eps. 383 & 384: ET's Cigar & Dry Sands
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From April, 2026.
Today's 2 topics:
- In 2012 as it crossed the orbit of Neptune heading towards the Sun a small space rock was 250 times fainter than can be detected by the Hubble Space Telescope. Five years later, after it had rounded the Sun, it became visible in asteroid hunter's telescopes for about 16 days, as it streaked across our planet's orbit at 37 miles per second, as it continued to move away from the Sun. During that brief period of time it was discovered by the PanSTARRS group in Hawaii, tracked by telescopes around the world, and given the name.
- The NASA Curiosity Rover has shown us evidence of ancient rivers and bodies of liquid water on the martian surface. Given its thin cold atmosphere, seeps of liquid water, presently on the surface of Mars which are capable of hosting microbial life appear to be unlikely. Scientists were thus surprised when high resolution imaging of the red planet's surface revealed thousands of intriguing dark streaks called RSL on hundreds of rocky slope areas. These fascinating features slowly extend down hill and grow during the martian warm season, fade during the colder season, and reappear during the next martian warm period.
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Sun, 11 Oct 2026 - 06min - 4290 - NOIRLab - First Magnetar Progenitor
Neutron stars, the compact remains of a massive star following a supernova explosion, are the densest matter in the Universe. Some neutron stars, known as magnetars, also claim the record for the strongest magnetic fields of any object. How magnetars, which are a mere 15 kilometers across, form and produce such colossal magnetic fields remains a mystery.
New observations by a team of astronomers, including NSF's NOIRLab's Dr. André-Nicolas Chené, may shed important light on the origin of these magnetic powerhouses. Using various telescopes around the globe, including the Canada-France-Hawai'i Telescope (CFHT) on Maunakea, the researchers have identified a new type of astronomical object — a massive magnetic helium star (an unusual variant of a Wolf-Rayet star), which may be the precursor of a magnetar.
In this podcast, André-Nicolas Chené describes the process of finding the first known potential magnetar progenitor.
Bios:
Rob Sparks is in the Communications, Education and Engagement group at NSF's NOIRLab in Tucson, Arizona.
Dr. André-Nicolas Chené is an associate astronomer at NOIRLab. He completed his PhD at the Université de Montréal in 2007 and learned everything about the fundamentals of astronomical observations at the Observatoire du Mont Mégantic. He was research fellow at the NRC Herzberg Astronomy and Astrophysics Research Centre and postdoc jointly at the Universidad de Concepción and the Universidad de Valparaíso before joining the Gemini Observatory (now a program of NOIRLab) in 2013. For almost 10 years, André-Nicolas took part in every phase of a Gemini observing program life cycle and has played a central role in Gemini's user support effort. André-Nicolas's research interests are massive stars, hot winds, star clusters, and stellar evolution.
Links:
NOIRLab Press Release: https://noirlab.edu/public/news/noirlab2323/
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Sat, 10 Oct 2026 - 17min - 4289 - EVSN - Cloudy With a Chance of Brown Dwarfs: Terrestrial, Exo & Space Weather
From September 23, 2026.
This week we're doing a weather check.
No, really. Let's talk about the weather! All of them!
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Fri, 09 Oct 2026 - 22min - 4288 - Equatorial SkyGuide - October SkyGuide
Hosted by our Director, Avivah Yamani.
Explore October 2026's equatorial skies as we have Saturn at opposition, Mercury at dusk, Orionid meteors, and the Moon's celestial encounters.
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Thu, 08 Oct 2026 - 06min - 4287 - Awesome Astronomy - Baby Planet, the New Crater & the Decagon
October Part 1.
Paul Hill and Dr. Jenifer "Dr. Dust" Millard host.
Damien Phillips, John Wildridge and Dustin Ruoff produce.
We dive into autumn with a baby Planet, the SMILE mission, New weather on Saturn, a new crater on the moon, an update on Nancy Roman and a mission to Phobos. As well as our monthly sky and moon guide.
SMILE Mission Gif:
https://www.esa.int/Science_Exploration/Space_Science/Smile/Science_begins_for_Smile
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Wed, 07 Oct 2026 - 1h 03min - 4286 - Ask A Spaceman Ep. 281: What Makes the Scattered Disk So Wild?
Solar System Badlands!
Hosted by Dr. Paul M. Sutter.
How did the scattered disk of the solar system form? What kins of strange objects roam those badlands? And what does it do to the rest of the solar system? I discuss these questions and more in today's Ask a Spaceman!
Support the show: http://www.patreon.com/pmsutter
All episodes: http://www.AskASpaceman.com
Watch on YouTube: http://www.youtube.com/PaulMSutter
Read a book: https://www.pmsutter.com/books
Keep those questions about space, science, astronomy, astrophysics, physics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE!
Big thanks to my top Patreon supporters this month: Justin G, Chris L, Alberto M, Corey D, Michael P, Naila, Sam R, Joshua, Scott M, Rob H, Scott M, Louis M, John W, Alexis, Gilbert M, Rob W, Jessica M, Jules R, Jim L, David S, Scott R, Heather, Mike S, Pete H, Steve S, Lisa R, Kevin B, Aileen G, Michael J, Phillip L, Steven B, Mark R, Alan B, Craig B, Richard K, Joe R, David P, Justin, Tracy F, Thomas K, James C, Syamkumar M, Mark D, Bruce A, Tim Z, Linda C, The Tired Jedi, Bob C, Stephen A, James R, Allen E, Michael S, Sheryl, David W, Chris, Michael S, Erlend A, James D, Karl W, Edward K, Scott K, Vivek D, M0PPET, Brad, Azra K, Steve R, M D Malahy, Brian O, Alonna M, Joseph B, Anders J, Blaine, Ry Guy, and Phil!
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Tue, 06 Oct 2026 - 28min - 4285 - Astronomy Cast Ep. 803: Mission Tech Series: Engines & Stages
https://www.youtube.com/watch?v=87imhw2ljNU
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Streamed on October 3, 2026.
Today our series continues with our deep dive into rockets, their engines & stages. We fall into the tyranny of the rocket equation and discover what it takes to escape Earth's gravity and head off into deep space.
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Mon, 05 Oct 2026 - 37min - 4284 - Travelers in the Night Eps. 381 & 382: Red Dwarf Planets & Fireball II
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From March 2026.
Today's 2 topics:
- Astronomers continue to be delighted when they discover an Earth sized planet. Scientists were thus very disappointed when the red dwarf star hosting the nearest such planet, Proxima Centauri b some 4.2 light years away, turns out to have the nasty habit of emitting bursts of radiation which are likely to sterilize and/or remove the atmospheres of it's family of planets. Recently, hope of finding a nearby Earth was rekindled when scientists at the European Southern Observatory in Chile discovered a small planet circling what appears to be a quiet, well behaved red dwarf star 11 light years from us.
- Recently there were four fireball meteors, brighter than the planet Venus, which exploded over Germany, France, Ohio, and Arizona within the space of only 10 hours. A total of 1,320 individuals were treated to light shows and reported their observations to the American Meteor Society. The one which exploded over Arizona was probably several feet in diameter and entered the Earth's atmosphere over Flagstaff. This event was observed in Arizona, California, Nevada, Utah, New Mexico, and Colorado. It was recorded by numerous electronic security and dashboard cameras and was visible for from 3 to 7 seconds.
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Sun, 04 Oct 2026 - 06min - 4283 - Space Stories - Astronomy Words: Dwarf Planet
Hosted by our Director, Avivah Yamani.
Why is Pluto a dwarf planet? Discover how new findings changed the definition of a planet—and our perspective on the Solar System.
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Sat, 03 Oct 2026 - 05min - 4282 - EVSN - All Things Solar System Evolution: Planet Formation, Composition & Asteroid Deflection
Hosted by: Dr. Pamela L. Gay (@CosmoQuest)
From February 20, 2020.
In today's episode we look at a variety of new results related to observing how planetary systems form, where planet ends up in solar system's (including in our own Jupiter's atmosphere!), and how rocks get flung at Earth even today.
Ice volcanoes videos etc.:
https://www.youtube.com/shorts/X3x9mOkN240
https://www.youtube.com/watch?v=HB27iJtxZrA
https://www.thehotelsaugatuck.com/blog/ice-volcanoes-and-ice-balls-oval-beach
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Fri, 02 Oct 2026 - 10min - 4281 - Actual Astronomy - October Observer's Calendar
Hosted by Chris Beckett & Shane Ludtke, two amateur astronomers in Saskatchewan who enjoy teaching astronomy classes and showing the public views through their telescopes. actualastronomy@gmail.com
(Times in Eastern)
- Oct 1: Moon at perigee; Beta Cephei colorful double star - Oct 2: Venus stationary; 41 Aquarii colorful double star; R Fornacis carbon star - Oct 3: Last Quarter Moon (9:25); Gegenschein high in S at midnight; 3 Cephei colorful double star - Oct 4: Saturn at opposition; Lunar Curtis X; Sirius unaided in daylight; Jupiter double shadow transit (12:49 AM); M30 well placed - Oct 5: Mars occulted by Moon (NW Canada); Mercury 5° N of Venus; Jupiter double shadow transit (7:03 PM); Europa & Callisto shadow double feature (3:24 AM); M2 & NGC 7009 well placed - Oct 6: Jupiter occulted by Moon (4:33 AM);Pallas at opposition; 161P/Hartley-IRAS well placed
- Oct 7: NGC 7293 (Helix Nebula) well placed - Oct 8: Zodiacal Light in E; M15 well placed - Oct 9: NGC 7331 well placed - Oct 10: New Moon (11:50); S Taurid meteors peak; Stephan's Quintet well placed; - Oct 11: Spot Vega unaided? Jupiter double shadow transit (2:42 AM); NGC 7023 well placed - Oct 12: Mercury greatest eastern elongation; Mercury near Moon; Jupiter double shadow transit (9:11 PM); NGC 40 well placed - Oct 13: Vesta at opposition; Spot Vesta unaided; M42 well placed - Oct 14: Antares near Moon - Oct 16: Moon at apogee - Oct 17: Hipparchus Ray (7:45 PM) - Oct 18: First Quarter Moon (12:13); Lunar X near Werner; Jupiter double shadow transits (4:42 AM & 7:07 AM); Maginus sunrise ray (7:00 PM) - Oct 19: Lunar Straight Wall - Oct 20: Jupiter double shadow transit (12:24 AM); 94 Aquarii colorful double star - Oct 21: Orionid meteors peak (ZHR=20); Jupiter double shadow transit (5:59 PM); WZ Cas colorful double star; R Leo max - Oct 23: Venus in inferior conjunction; Crater Baily (9:00 PM) - Oct 24: Mercury stationary; Crater Baily (9:00 PM); Tycho Brahe died (1601) - Oct 25: Full Moon; Jupiter double shadow transit (7:18 AM) - Oct 26: Mare Orientale (9:00 PM) - Oct 28: Moon at perigee; Jupiter double shadow transit (8:35 PM) - Oct 31: Halloween; X Cnc carbon star in pre-dawn; Z Psc carbon star in eveningWe've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
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Thu, 01 Oct 2026 - 37min - 4280 - Awesome Astronomy - An American Astronomer in Cwmdu
September Part 2.
Dustin Ruoff (!!!) and Dr. Jenifer "Dr. Dust" Millard host.
Damien Phillips, John Wildridge and Dustin Ruoff produce.
Live from AstroCamp! It's Chatty McChatty time again!
Dustin pops over the pond for a visit to AstroCamp!
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Wed, 30 Sep 2026 - 59min - 4279 - Cheap Astronomy - Dear CA Ep. 140: Objects & Objectives
Objective: objects!
Hosted by Steve Nerlich.
Dear Cheap Astronomy – How often does the solar system capture or eject things?
The first evidence that stellar systems might eject things were observations of rogue planets knocked out of their systems due to gravitational interactions and now populating interstellar space. For every rogue planet knocked out its system there are likely thousands of smaller objects also knocked out that are just too small for us to observe. We call this rogue population interstellar objects.
Dear Cheap Astronomy – What else is going on in the asteroid mining space?
What are the alternatives to CSOTM (Crash Shirt On The Moon)?
Good question. There have been a number of attempts to create an asteroid mining industry despite the obvious lack of access or technological solutions. Such 'start ups' have been largely built on venture capital – the support of investors willing to take a gamble on investing in a venture unlikely to deliver profit in the near future. Asteroid mining was the focus of the high-profile Deep Space Industries launched in 2013 which developed some ideas for utilization of off-world resources, including building spacecraft and an orbiting platform for the collection and processing of off-world water for rocket fuel production, but nothing ever got off the ground and the venture, largely a think-tank, was bought out in 2019.
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Tue, 29 Sep 2026 - 14min - 4278 - Astronomy Cast Ep. 802: Mission Tech Series: Rocket & Spacecraft 411
https://www.youtube.com/watch?v=hW_eLqrmjZ4
Streamed live on Sep 21, 2026
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Today we begin a new series on rockets and spacecraft, dealing with each of their components. It's a big job, so it'll take us a bunch of episodes to get through. Today let's do an introduction about what we're gonna talk about in this series: rockets from tip to tail, soup to nuts.
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Mon, 28 Sep 2026 - 33min - 4277 - Travelers in the Night Eps. 379 & 380: Well Done & Odd Ball
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From March 2026.
Today's 2 topics:
- Once every 1,435 days , a 780 foot diameter space rock, 2017 TC1, that my Catalina Sky Survey teammate Carson Fuls discovered makes an annihilation defying close approach to our star. At it's nearest point to the Sun, Carson's well done space rock is traveling at an amazing 93 miles per second and receives 26 times the amount of solar radiation that heats the surface of the planet Mercury to 800° F. After Carson first discovered his heat resistant space rock traveling towards it's next hot date with the Sun, it was observed by telescopes in New Mexico, Arizona, Hawaii, and England.
- The orbits of the planets are closely aligned with the extension of the Sun's equator into space and are contained within the flattened disk of material which forms the plane solar system. Most asteroids have orbits with inclinations or tilts to the solar system's plane which are less than 20 degrees. Thus, when my Catalina Sky Survey teammate Rose Matheny discovered 2017 TF4, a small space rock which soars into the lonely space high above and below our solar system's plane, it got our attention. As with all of our asteroid discoveries, Rose had no idea of what kind of object she had discovered with our Schmidt Telescope on Mt. Bigelow, Arizona until it had been tracked by observers around the world.
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Sun, 27 Sep 2026 - 06min - 4276 - Guide To Space - Universe Today News: BepiColombo Successfully Begins Its Final Descent To Mercury
https://www.universetoday.com/articles/bepicolombo-successfully-begins-its-final-descent-to-mercury
Written by Andy Tomaswick - September 09, 2026.
Read by our editor, Richard Drumm.
The latest mission to the innermost planet in the solar system hit a milestone last week. After an eight year journey, BepiColombo finally separated from its propulsion stage to set itself up for an orbital insertion to Mercury.
Taking place on September 3rd, the separation, which is part of a much longer series of logistical steps over the next few months, seemed to go without a hitch. Because the two spacecraft were, um, hitched together, and… Ahem. But getting to that point was certainly a process, and still more challenges lie ahead.
Bio:
Andy Tomaswick
Andy has been interested in space exploration ever since reading Pale Blue Dot in middle school. An engineer by training, he likes to focus on the practical challenges of space exploration, whether that's getting rid of perchlorates on Mars or making ultra-smooth mirrors to capture ever clearer data. When not writing or engineering things he can be found entertaining his four children, six cats, and two dogs, or running in circles and throwing plastic discs at people to stay in shape.
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Sat, 26 Sep 2026 - 07min - 4275 - EVSN - No Good, Very Bad News and Some Planetary Palate Cleansers
From September 16, 2026.
Join us as we bounce between the geology behind the recent landslide in Nepal and Tibet, the joy of Saturn's south pole forming a decagon, the frustration of both US and Russian space programs having launch capacity issues, and the good news of BepiColombo getting ready to enter Mercury's orbit.
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Fri, 25 Sep 2026 - 27min - 4274 - H'ad Astra Historia - Ep. 305: You're So Predictable
Hosted by Loretta Cannon.
Today's 'guest' is the planet Neptune. I'm telling the story of the discovery of Neptune 180 years ago in September, 1846. It was initially identified using mathematics rather than a telescope. This is a story of missed opportunities, undisclosed data, a bit of professional rivalry, and a controversy that some still argue today.
H'ad astra historia is the official podcast for the Historical Astronomy Division of the American Astronomical Society. We're here to share stories from and about the people who study the stars, planets, and the cosmos. We'll be hearing from individuals who not only study the history of astronomy, but also those who lived it, who were "in the room" during pivotal events within the last 50 years or so.
podcast theme music: "Frost Waltz" Kevin MacLeod (incompetech.com), licensed under creative commons: by attribution 4.0 license (http://creativecommons.org/licenses/by/4.0/)
Loretta Cannon (an AAS affiliate via Rose City Astronomers) is a science-and-word-nerd who really likes outer space and the people who study it. She quite enjoys working as HAD's podcaster, sharing astronomy stories to you.
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Thu, 24 Sep 2026 - 35min - 4273 - Space Stories - Astronomy Words: Light Year
Hosted by our Director, Avivah Yamani.
A light-year measures distance, not time, but it also lets us see the past. Discover how light turns every telescope into a cosmic time machine.
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Wed, 23 Sep 2026 - 06min - 4272 - Ask A Spaceman Ep. 280: Wait, So We Can Steal Energy From Black Holes?
Black Hole Power!
Hosted by Dr. Paul M. Sutter.
What is frame dragging? How do we measure it? And how can we turn this into a method for extracting energy from rotating black holes? I discuss these questions and more in today's Ask a Spaceman!
Support the show: http://www.patreon.com/pmsutter
All episodes: http://www.AskASpaceman.com
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Keep those questions about space, science, astronomy, astrophysics, physics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE!
Big thanks to my top Patreon supporters this month: Justin G, Chris L, Alberto M, Corey D, Michael P, Naila, Sam R, Joshua, Scott M, Rob H, Scott M, Louis M, John W, Alexis, Gilbert M, Rob W, Jessica M, Jules R, Jim L, David S, Scott R, Heather, Mike S, Pete H, Steve S, Lisa R, Kevin B, Aileen G, Deb A, Michael J, Phillip L, Steven B, Mark R, Alan B, Craig B, Richard K, Joe R, David P, Justin, Tracy F, Thomas K, James C, Syamkumar M, Homer V, Mark D, Bruce A, Tim Z, Linda C, The Tired Jedi, Bob C, Stephen A, James R, Allen E, Michael S, Sheryl, David W, Chris, Michael S, Erlend A, James D, Karl W, Den K, Edward K, Scott K, Vivek D, M0PPET, Brad, Azra K, Steve R, M D Malahy, Brian O, Alonna M, Joseph B, and Anders J!
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Tue, 22 Sep 2026 - 29min - 4271 - Astronomy Cast Ep. 801: The Beginning & End of Everything - Part 2
https://www.youtube.com/watch?v=jFzHdB1nM9Y - With credits added.
Streamed live on Sep 7, 2026.
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
This show is supported through people like you on Patreon.com/AstronomyCast
Today we do the sequel to our 2-part series. We jump to the end of the Universe, and all the major moments that will occur from now until the heat death of the Universe. The end of everything.
- The fate & future of the Milky Way
- Cosmic isolation
- The cosmic microwave background
- The end of star formation
- The degenerate era
- Proton decay and entropy
- Black hole evaporation & entropy
- Alternate endings, cosmic rip, new beginnings
- Closing thoughts and updates
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Mon, 21 Sep 2026 - 38min - 4270 - Travelers in the Night Eps. 377 & 378: Fission Rocket & Enormous Visitor
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From February 2026.
Today's 2 topics:
- To get an idea of the energy involved in a rocket launch, the NASA Saturn V, moon rocket, fully fueled on the launch pad contained the chemical energy of 2,000 pounds of TNT. This old technology could carry us to Mars and back on missions that would last years. To cut the mission time, the (radiation) risks, and the mass of supplies required for such a prolonged space mission NASA is looking at alternative means of rocket propulsion. Back in the 1950s NASA's project Orion was a study to investigate propelling a rocket by a series of atomic bomb explosions behind the vehicle.
- Without additional data, the true nature of the rapidly northward moving point of light my Catalina Sky Survey teammate Carson Fuls (the new Director of CSS) had just discovered would have remained a mystery. Fortunately, this new object was tracked by telescopes in both Arizona and New Mexico. These data were used to calculate it's orbit around the Sun, estimate it's size, and give it the name 2017 UX5. When Carson first spotted this enormous 1,200 foot diameter space rock it was more than 30 million miles away traveling in our direction at 10.7 mi/s. It's orbit and that of the Earth's nearly intersect and at the closest point they are about two and one half times the Moon's distance from us apart.
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Sun, 20 Sep 2026 - 06min - 4269 - Astroman - F Is For Full Moon
Exodus talks about Moon phases.
"ASTROMAN: the Dark Sky Guardian" is a podcast channel that aims to explore popular science in multiple disciplines and research on interdisciplinary approaches, such as sustainability, dark-sky protection, astrophotography, space exploration, astronomy innovation, inclusive science communication, and STEAM Education by integrating science and arts.
Exodus Chun-Long Sit, also known as the ASTROMAN, is a transmedia astronomy educator, popular science author, STEAM educator, and science communicator in Hong Kong. He is recently the National Astronomy Education Coordinator (Chair of Hong Kong, China) of the International Astronomical Union and President of Starrix. He was also an International Committee Member of the Dark Sky International, regularly organizing public lectures at the Hong Kong Space Museum and the Hong Kong Science Museum. He was also the author of a popular science book "Decoding the Starry Night: A Guide to Stargazing and Astrophotography".
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Sat, 19 Sep 2026 - 09min - 4268 - EVSN - Betelgeuse: Smaller & Closer Than Previously Thought… What?
From October 19, 2020.
Hosted by: Dr. Pamela L. Gay (@CosmoQuest)
Today's top story brings back our favorite red giant star, Betelgeuse. A new paper published in The Astrophysical Journal (ApJ) with lead author Dr. Meridith Joyce looks at Betelgeuse as a pulsating variable star and uses atmospheric physics to bring us new insights on what the red giant is up to.
This paper combines new observations with new computer models to derive the star's mass and size from its outward behavior in much the same way that one might derive the size of a jug based on what notes can be created by blowing across its opening. Different sized objects naturally resonate in specific ways. By understanding how Betelgeuse pulsates in the fundamental mode and first overtone mode – those first two pitches you can make with your bottle – they were able to work backward to figure out Betelgeuse's physical size. This method let them then figure out more accurately the star's distance because we know how big it appears on the sky, and there is a simple mathematical relationship between how big something is and how big it appears.
Our current estimates had been based on Hipparcos measurements of how Betelgeuse appears to move relative to background objects when the Earth moves around the Sun. This technique, called parallax, can be super useful, but, trying to measure how much an object shifts, when that object is a blobby star like Betelgeuse, can be a challenge!
Betelgeuse appears to be about 42 microarcseconds (mas) across and seems to shift just 5.95+0.58 or -0.85 mas. This is a really hard measurement, and Betelgeuse hasn't been looked at yet with Gaia.
By working from the theoretical size they got from its pulsation modes, and calculating a new distance, this team found that the lower edge of that error in the distance appears to be accurate, putting Betelgeuse just 530 lightyears away. This is 25% of the distance from the prior estimate, but as I said, it's within error. This closer distance makes Betelgeuse a bit smaller; it appears to be 750 times the radius of the Sun. Nevertheless, it still probably started with 20+ solar masses of material, and it will still explode in about 100,000 years. At this point, they believe, it is still burning helium in its core and is nowhere near going boom.
It's always cool when completely different techniques can narrow in on more precise values. This shows us once again that there is no one way to do science.
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Fri, 18 Sep 2026 - 16min - 4267 - Actual Astronomy - Top Ten Techniques for Buying Used Telescope Gear
Hosted by Chris Beckett & Shane Ludtke, two amateur astronomers in Saskatchewan who enjoy teaching astronomy classes and showing the public views through their telescopes. actualastronomy@gmail.com
Top ten techniques for buying used telescope gear on Episode 552 of the Actual Astronomy podcast. I'm Chris and joining me is Shane. We are amateur astronomers who love looking up at the night sky and this podcast is for everyone who enjoys going out under the stars.
New vs. used:
Baked in discount Cheaper way to try different things Less cost to buy try sell than new and get hit by depreciation Great out of production gearTop 10 Ways to Choose Used Telescope Equipment:
Dedicated Astronomy Classifieds: Buy through enthusiast platforms like Cloudy Nights or AstroBuySell or online Japan Auction Sites rather than general marketplaces although I've had good luck on eBay too. Astronomy forums feature seller rating systems, community feedback, and knowledgeable owners who generally take better care of their optics. Inspect Glass and Mirrors for Mold or Coating Loss: A little dust on optics is normal, but avoid equipment with scratches, flaking coatings, or fungus/mold. Mold grows in damp storage conditions and permanently eats away at optical coatings. Test Mechanical Operations In Person: Arrange local pickup whenever possible to test the gear. Rack the focuser through its full range to ensure smooth motion, verify that mount lock knobs tighten properly, and check for wobbles or stripped threads. Verify GoTo Electronics and Tracking Motors: For computerized or tracking mounts, power on the unit to test motor slewing, controller screens, and firmware updates. Check battery compartments for acid corrosion, which frequently ruins neglected electronics. Compare Against Retail Pricing:Cross-reference the original retail listing to check the standard asking price (fair used prices generally hover around 60–75% of current retail) and confirm that missing essentials like counterweights, hand controllers, or finder scopes are accounted for in the deal.
Ask for Close-Up Photos and "Pencil" Tests: If buying remotely, request high-resolution, unedited photographs of optics from multiple angles. Asking the seller to place a specific object (like a handwritten note) next to the gear helps verify that they actually possess the equipment. Inquire About Storage and Service History: Ask where the equipment was stored. Mounts kept in unconditioned sheds or outdoor garages are prone to rusted gears, degraded grease, and moisture damage. High-end mounts may also have a documented service history. Watch Out for DIY Modifications: Amateur astronomers frequently alter equipment. Ensure any past modifications—such as custom focuser upgrades, flocking, or drilled mounting plates—were executed professionally and won't hinder performance or future resale value. Evaluate Mount Payload Capacity Realistically: Don't evaluate a telescope tube in isolation; ensure the bundled or intended mount can handle the weight. For astrophotography, plan for a payload weight that is no more than half of the mount's advertised maximum capacity. Use Secure Payment Methods with Buyer Protection: When paying online or via long-distance shipping, always use payment channels that offer buyer protection (such as standard PayPal Purchase options rather than "Friends & Family") to safeguard against scams or damaged goods. Ensure the item is well protected with proper packaging. Purchase shipping insurance when acquiring expensive gear.We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
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Thu, 17 Sep 2026 - 55min - 4266 - Deep Astronomy - The Triangulum Galaxy: The Most Distant Naked Eye Object
https://www.youtube.com/watch?v=VmzJj2i81H0
Hosted by Tony Darnell.
From Nov 7, 2017.
Have you ever wondered what the most distant object we can see with our naked eyes is? The answer is The Triangulum Galaxy some three million light years from Earth. This galaxy, along with the Great Andromeda Galaxy will collide with our Milky Way in about four billion years. This galaxy collision will herald in a new era for our home galaxy The Milky Way. We will transform into an entirely new galaxy with billions more stars.
If you like this content, please consider supporting Deep Astronomy on Patreon!
Created with Stellarium Open Source Software:
Original Music - Mark C. Petersen, Lochness Productions:
https://www.lochnessproductions.com/
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Wed, 16 Sep 2026 - 06min - 4265 - Cheap Astronomy - Dear CA # 139: Clearing the Neighborhood
Saving the world on a tight budget.
Hosted by Steve Nerlich.
Dear Cheap Astronomy – Can we clear all the PHOs from around Earth?
A key feature of Cheap Astronomy's CSOTM (Crash Shirt On The Moon) proposal is that the most readily available source of shirt to crash are near Earth asteroids and a small number of comets. This has the double benefit of putting all the raw materials in one place, plus you are clearing out potentially hazardous objects that could collide with Earth at some time in the future.
Dear Cheap Astronomy – Can we really deflect asteroids with rocket engines?
This is a follow up episode to our recent one about crashing near-Earth objects on the Moon. Where a listener wrote to critique a throw-away line we made about attaching a rocket engine to an asteroid, particularly if it was a rubble pile asteroid. They were too polite to say it's a dumb-@$$ idea, but yeah, it is probably a dumb-@$$, well sort-of maybe.
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Tue, 15 Sep 2026 - 15min - 4264 - Astronomy Cast Ep. 800: The Beginning & End of Everything - Part 1
https://www.youtube.com/watch?v=CDFCqCj0ofk
Streamed live on Sep 7, 2026.
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
This show is supported through people like you on Patreon.com/AstronomyCast
To celebrate our 20th season, we thought we'd go back right to the beginning… of everything. Let's wind the clock back to the earliest moments of the Universe, where we'll measure time in fractions of a second. As the foundational laws of physics were laid down and we experience the repercussions to this day!
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------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Mon, 14 Sep 2026 - 40min - 4263 - Travelers in the Night Eps. 375 & 376: Extraterrestrial Whales & Tiny Space Rock
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From February 2026.
Today's 2 topics:
- In an area which is about 1/400th of the entire sky, the NASA Kepler spacecraft has discovered 30 Earth like planets which are likely to have liquid water on their surfaces orbiting distant stars. These planets are likely to represent a tiny sample of the habitable planets which exist in the Milky Way. In spite of our efforts to find them, the question remains where are the alien civilizations? In a recent talk given at the Division of Planetary Sciences meeting Dr. Alan Stern of the Southwest Research Institute suggests that perhaps the majority of worlds with biology and intelligent civilizations exist on interior water ocean worlds where their existence is hidden by the thick layers of rock and ice which separate them from the hostile vacuum of space.
- Eighteen hours before my Catalina Sky Survey teammate Rose Matheny first spotted 2017 UJ2, a small space rock with our Schmidt telescope on Mt. Bigelow, Arizona it had passed less than the Earth's diameter from the surface of our planet. Rose was able to discover this Smart Car sized space rock after it moved out of the Sun's glare. At this point it was about the Moon's distance from her and was traveling away at 3.4 mi/s. After Rose posted her discovery observations on the Minor Planet Center's Near Earth Object Confirmation page, for the next 24 hours it was tracked by telescopes in Spain, Illinois, and Arizona.
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------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sun, 13 Sep 2026 - 06min - 4262 - NOIRLab - The DESI Legacy Imaging Surveys
Hosted by Rob Starks.
The newest DESI Legacy Imaging Surveys map, 13 years in the making, covers three-quarters of the sky and catalogs nearly four billion objects. This treasure trove is available to all and contains stars, galaxies, supernovae, gravitational lenses, and much more. Two NSF NOIRLab facilities contributed data to the map: the U.S. National Science Foundation (NSF) Mayall telescope and the NSF Blanco telescope, equipped with the U.S. Department of Energy-fabricated DECam. In this podcast, Dr. John Moustakas discusses the surveys, the data and how it will impact future astronomical research.
Dr. John Moustakas is an associate professor of physics and the Department Chair in the Department of Physics & Astronomy at Siena University.
His broad research interests are in observational cosmology and astrophysics, with a focus on using the most powerful telescopes on earth and in space to understand how galaxies have formed and evolved (changed) in a 14 billion-year universe which is dominated by dark matter. He is also interested in dark energy, the mysterious cosmic phenomenon which is causing the expansion rate of the universe to accelerate.
Rob Sparks is in the Communications, Education and Engagement group at NSF's NOIRLab in Tucson, Arizona.
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------------------------------------
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------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sat, 12 Sep 2026 - 18min - 4261 - EVSN - Newly Discovered Solar System Object is 'Farfarout'
From February 15, 2021.
A newly found object nearly four times farther out from the Sun than Pluto now holds the record for the farthest observed in our solar system. Plus, forming Super Earths, finding potentially habitable planets, jellyfish galaxies, the Crab Nebula, and this week's What's Up.
D100 in the Coma Cluster:
https://science.nasa.gov/asset/hubble/h-alpha-tail-of-d100/
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------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Fri, 11 Sep 2026 - 23min - 4260 - Guide To Space - Universe Today News: 7 Stage Journey Reveals How Falling Space Rocks Survive Air
https://www.universetoday.com/articles/7-stage-journey-reveals-how-falling-space-rocks-survive-air
By Laurence Tognetti, MSc - August 31, 2026.
Recorded by our Editor, Richard Drumm.
At least once in our lives, we've all seen a bright streak of light briefly blaze across the sky and have quickly referred to it as an asteroid, meteor, shooting star, comet, or some other whimsical name we've heard others use to describe it. For those calling it a meteor, you would be correct, but we'll touch upon this later. The time it takes for a space rock, bolide being its scientific name, to travel through Earth's atmosphere and crash into the ground literally takes only a few seconds. But what happens to a space rock during this very brief travel time, and how can scientists use this to learn about a specific space rock's origin and the potential damage it could cause if it explodes in mid-air?
Phase 1: Atmospheric entry;
Phase 2: Brightness begins;
Phase 3: Brightness increases with fireball appearance;
Phase 4: Brightness maintains while melting begins;
Phase 5: Front of rock begins to break apart;
Phase 6: Back of rock breaks apart;
Phase 7: Melting and breaking apart continue until glowing stops, followed by melting ending and wind discards crusted pieces.
[Editor's Note: OK, that could be 8 stages if you'd prefer…]
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Thu, 10 Sep 2026 - 08min - 4259 - Big Impact Astronomy - Inspiring the World Through Astronomy With Dr. Kelly Blumenthal
https://www.youtube.com/watch?v=R6lOpIWbly4
From July 23, 2026.
Hosted by Mike Simmons. Episode 19.
https://astro4equity.org - Visit our website!
Dr. Kelly Blumenthal is an astrophysicist and science communicator who has lived in and worked with many communities across the United States and worldwide. These experiences have shaped Kelly's perspectives on the importance of astronomy communication in building STEM opportunities for under-resourced people worldwide and its role in science generally. Kelly is now the director of the International Astronomical Union's Office of Astronomy Outreach (OAO), hosted by the National Astronomical Observatory of Japan in Tokyo. The Office is represented by its network of National Outreach Coordinators in more than 100 countries.
In this episode, Kelly shared her experience working as an astrophysicist and how she became the OAO's Director, the importance of science communication, dark skies, and the development of AstroACCEL.
The Role of Astronomy in Science Communication: 0:00 Engaging Communities Through Astronomy Outreach: 5:44 Professional Development in Astronomy Communication: 9:02 The Importance of Conferences in Astronomy Outreach: 11:18 Case Studies in Astronomy Education: 13:20 Astronomy as a Gateway to STEM: 18:10 Highlighting Women in Astronomy: 23:40 Protecting Our Dark Skies: 27:49 Engaging Youth in Astronomy Education: 32:20 Bridging Gaps in Astronomy Communication: 34:32 Personal Journeys in Astronomy: 41:22 Navigating Challenges in Astronomy Careers: 53:10
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------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Wed, 09 Sep 2026 - 51min - 4258 - Ask A Spaceman Ep. 279: What Can We Actually Find on an Exoplanet?
Mapping Alien Worlds!
Hosted by Dr. Paul M. Sutter.
Just how hard are exoplanets observations? What kind of telescope will it take to find life? And how much information can we get out of a single pixel of light? I discuss these questions and more in today's Ask a Spaceman!
Support the show: http://www.patreon.com/pmsutter
All episodes: http://www.AskASpaceman.com
Watch on YouTube: http://www.youtube.com/PaulMSutter
Read a book: https://www.pmsutter.com/books
Keep those questions about space, science, astronomy, astrophysics, physics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE!
Big thanks to my top Patreon supporters this month: Justin G, Chris L, Alberto M, Corey D, Michael P, Naila, Sam R, Joshua, Scott M, Rob H, Scott M, Louis M, John W, Alexis, Gilbert M, Rob W, Jessica M, Jules R, Jim L, David S, Scott R, Heather, Mike S, Pete H, Steve S, Lisa R, Kevin B, Aileen G, Deb A, Michael J, Phillip L, Steven B, Mark R, Alan B, Craig B, Richard K, Joe R, David P, Justin, Tracy F, Thomas K, James C, Syamkumar M, Homer V, Mark D, Bruce A, Tim Z, Linda C, The Tired Jedi, Bob C, Stephen A, James R, Allen E, Michael S, Sheryl, David W, Chris, Michael S, Erlend A, James D, Karl W, Den K, Edward K, Scott K, Vivek D, M0PPET, Brad, Azra K, Steve R, M D Malahy, Brian O, Alonna M, Joseph B, and Anders J!
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------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Tue, 08 Sep 2026 - 31min - 4257 - Astronomy Cast Ep. 53: Astronomy in Science Fiction
From September 10, 2007.
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
This is a very different episode of Astronomy Cast. As we mentioned last week, Pamela recently attended the Dragon*Con science fiction convention in Atlanta, Georgia. While she was there, she participated in a special live edition of Astronomy Cast with special guest Dr. Kevin Frazier. Kevin is a NASA scientist, and the science consultant for the TV shows Battlestar Galactica and Eureka. He and Pamela work through physics and astronomy in popular science fiction. What they get right, and what they get wrong... so very wrong.
Role of Science Consultants in Media: Dr. Grazier shares insights into his work as a science consultant, emphasizing the importance of scientific accuracy in storytelling and how it enhances narrative credibility. Analysis of Battlestar Galactica and Eureka: The conversation explores specific examples from these series, highlighting where scientific principles are accurately depicted and where creative liberties are taken. Common Misconceptions in Sci-Fi: They address prevalent scientific inaccuracies in science fiction, such as sound in space and unrealistic space travel mechanics, and discuss their impact on public understanding of science. Balancing Science and Storytelling: The discussion delves into the challenges writers face in integrating complex scientific concepts into engaging narratives without overwhelming the audience. Audience Interaction: Recorded live at Dragon*Con, the episode features questions from the audience, providing additional perspectives and inquiries about science in media.We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Mon, 07 Sep 2026 - 58min - 4256 - Travelers in the Night Eps. 373 & 374: Plant Companionship & Earth's Pet Rock
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From January & February 2026.
Today's 2 topics:
- On Earth, human life is enabled by plants which provide us with calories, vitamins, fuel, medicines, and oxygen to breathe. In addition, recent scientific studies indicate that plant cultivation reduces anxiety and depression and has a positive influence on diabetes, heart disease, obesity, and longevity. Perhaps this is the reason that 80% of the cultivated plant species on planet Earth are not used for any food related purpose. On long duration space missions astronauts live in close quarters isolated from the natural world where the basic activities like eating, sleeping, and attending to bodily functions are difficult and stress producing.
- On it's gravitational leash, Earth's pet space rock, 2016 HO3, accompanies us at a distance of between 38 and 100 times the Moon's distance from Earth as we both travel about the Sun. As this tiny asteroid orbits the Sun it spends about half of its time inside the Earth's orbit where it moves faster and passes ahead of us and the other half of its yearly path outside of our orbit which causes it to lag behind our home planet. Since its discovery little has been known about Earth's pet space rock leaving some to speculate that perhaps it is an old rocket booster or other piece of space junk.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sun, 06 Sep 2026 - 06min - 4255 - Equatorial Sky Guide - September
Hosted by our Director, Avivah Yamani.
September's equatorial sky features Venus, Saturn, Mars, Jupiter, dark Milky Way nights, the September equinox, and a lunar occultation of Venus.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sat, 05 Sep 2026 - 09min - 4254 - EVSN - On Background: The Anatomy of a Comet
Hosted by: Dr. Pamela L. Gay (@CosmoQuest)
From September 1, 2026.
In this special episode, funded by the National Science Foundation, we're taking a break from the headlines to study the changing anatomy of a comet.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Fri, 04 Sep 2026 - 12min - 4253 - Actual Astronomy - The Observer's Calendar for September
Hosted by Chris Beckett & Shane Ludtke, two amateur astronomers in Saskatchewan who enjoy teaching astronomy classes and showing the public views through their telescopes. actualastronomy@gmail.com
In Episode 549 of Actual Astronomy, hosts Chris and Shane present the Observer's Calendar for September 2026, highlighting key celestial events for amateur astronomers throughout the month. Highlights include the Sept 1 Aurigids meteor shower peak, a Venus-Spica conjunction on Sept 2, two regional star parties in early September, and a Moon occultation of Jupiter on Sept 8. Observing targets throughout the month feature various lunar features like the Lunar X and Straight Wall, deep-sky objects, multiple carbon stars, Neptune reaching opposition on Sept 25, and the Harvest Full Moon on Sept 26.
Sept 1: Aurigids peak (ZHR=10) predawn; γ Del double star; M27 well placed in evening
Sept 2: Venus 1.7° South of Spica
Sept 4: Last Quarter Moon (2:11)
Sept 5: Lunar X visible
Sept 6: Alberta Star Party begins; Mars 3° South of Moon; Moon at perigee; NGC 6781 well placed; B142/3 well placed; Carbon star W Orionis in pre-dawn
Sept 7: Labour Day; M71 well placed; Carbon star HK Lyr in evening
Sept 8: Northern Prairie Star Party begins; Moon occults Jupiter (2:58 pm); M27 well placed; Max R Aql (9:00 pm); Star Trek 60th anniversary
Sept 9: NGC 6905 well placed; Carbon star RV Mon in pre-dawn; Zodiacal Light in E before morning twilight
Sept 10: New Moon (23:27); Uranus Stationary; Old crescent Moon in E before sunrise; M39, M29 well placed
Sept 11: Veil Neb well placed
Sept 12: NGC 7000 well placed
Sept 13: NGC 6946 well placed
Sept 14: Venus 0.5° South of Moon; IC 5146 well placed; Carbon star U Cyg in evening
Sept 15: NGC 6819 well placed
Sept 16: NGC 6826 well placed
Sept 17: First Quarter Moon (18:44)
Sept 18: Venus greatest illuminated extent;
Sept 19: Lunar Straight Wall this evening; Two shadows on Jupiter visible (9:03 pm)
Sept 20: Follow Capella unaided into daylight this week
Sept 22: Autumnal Equinox (12:00 am); Jeweled Handle (12:00 am)
Sept 24: Crater Billy (9:00 pm)
Sept 25: Neptune at opposition;
Sept 26: Full Moon / Harvest Moon (12:49); Two shadows on Jupiter (10:56 pm); Mare Orientale (9:00 pm); Crater Einstein (4:00 am); Carbon star V Cyg in evening
Sept 30: 192 Nausikaa at opposition (m=8.4)
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Thu, 03 Sep 2026 - 26min - 4252 - Awesome Astronomy - Holy Flipping Galaxies Batman!
September Part 1!
Paul Hill and Dr. Jenifer "Dr. Dust" Millard host.
Damien Phillips, John Wildridge and Dustin Ruoff produce.
So it turns out…
-The Milky Way may have done a back flip…
-News about the Swift telescope,
-NASA raiding its bare cupboards, and
-A super fast star.
-A nova in Sagitta!
Also…
-Our usual skyguide and wittering.
-Oh, and a song.
You will be full of antici……….pation!
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Wed, 02 Sep 2026 - 59min - 4251 - Deep Astronomy - The Most Distant Galaxy Ever Measured
https://www.youtube.com/watch?v=frcLSXuzzyY
Hosted by Tony Darnell.
From October 24, 2010.
On Oct 19, 2010, astronomers announced the measurement of a redshift of 8.6 for one of the galaxies in the Ultra Deep Field. That corresponds to a galaxy seen just 600 million years after the Big Bang!
Here's the news release from ESO's website:
http://www.eso.org/public/news/eso1041/
The Nature paper:
https://www.eso.org/public/archives/releases/sciencepapers/eso1041/eso1041.pdf
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Tue, 01 Sep 2026 - 06min - 4250 - Astronomy Cast Ep. 8: Meteor Showers. Yes, the Sky is Falling!
http://www.astronomycast.com/archive/
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
From October 30, 2006.
Dress warmly, gather some friends and family, and head outside to watch sand burn in the upper atmosphere. There's nothing like a good meteor shower. Fraser and Pamela explain this beautiful phenomenon: what causes them, the best storms and showers to watch for, and different types of meteors you might see.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Mon, 31 Aug 2026 - 26min - 4249 - Travelers in the Night Eps. 371 & 372: Kiwi Nights & Close Ones
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From January, 2026.
Today's 2 topics:
- New Zealand's 4.5 million people are concentrated in three major population centers which to various degrees suffer from the modern plague of light pollution. However, most of New Zealand's large rural areas and land reserves, covering an area as large as the UK, have unpolluted natural night skies. A completely unique place to experience New Zealand's natural night sky is the Aotea-Great Barrier Island International Dark Sky Sanctuary. It encompasses New Zealand's, 110 square mile, sixth largest island, which is located about 62 miles from central Auckland. It is easily accessible by boat or a short airline flight.
- In less than 24 hours, while observing with the Catalina Sky Survey's 60 inch telescope on Mt. Lemmon, Arizona, I discovered two 25 foot diameter space rocks that can theoretically pass less than a quarter of the Moon's distance from us. After I posted my discovery observations on the Minor Planet Center's Near Earth Object Confirmation page one of them received immediate attention, as an incoming object, and was tracked by observers at 14 different observatories around the world. Scientists at the Minor Planet Center used these data to calculate its 926 day orbital path around the Sun, estimate its size, and give it the name 2017 TH5.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sun, 30 Aug 2026 - 06min - 4248 - Space Stories - Syzygy, When Worlds Line Up
Hosted by our Director, Avivah Yamani.
What is a syzygy? Explore one of astronomy's strangest words and discover how the Sun, Earth, Moon, eclipses, transits, and tides are all connected by cosmic alignment.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Sat, 29 Aug 2026 - 07min - 4247 - EVSN - After Hours #8: Making Moons & Getting Cratered With William K Hartmann
Hosted by: Dr. Pamela L. Gay (@CosmoQuest)
From August 13, 2026.
Across a long career, Dr. William Hartmann has done everything from innovating how the Moon was formed to founding the Planetary Science Institute to defining space art for a new generation; a generation that included host Pamela Gay. Tune in to hear about science, art, and how they can mix as individuals both make new discoveries, and the illustrations to accompany them!
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Fri, 28 Aug 2026 - 50min - 4246 - Guide To Space - Are Aliens Watching Us & How Could We Hide? With Dr. David Kipping
https://www.youtube.com/watch?v=Rx1276dpHe4
From Jan 14, 2020.
Hosted by: Fraser Cain (@frasercain)
Once again, at the AAS Meeting in Hawaii, I got a chance to sit down with another astronomer to talk about their research. This time it was Dr. David Kipping from Columbia University's Cool World's Lab. We talked about how easy it'll be for aliens to know our planet is inhabited, and some ways we might be able to hide the evidence of our existence.
Dr. Kipping's channel:
https://www.youtube.com/channel/UCGHZpIpAWJQ-Jy_CeCdXhMA
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Thu, 27 Aug 2026 - 25min - 4245 - Deep Astronomy - NASA's TESS Finishes First Year of Exoplanet Science Operations
https://www.youtube.com/watch?v=ivzbZRWkMUg
Hosted by Tony Darnell.
From Nov 12, 2019.
NASA's Transiting Exoplanet Survey Satellite has completed its first year of science operations and to show for it, NASA has released this amazing mosaic of the entire southern celestial hemisphere.
This video was written by NASA Goddard folks, you can watch the original here:
https://svs.gsfc.nasa.gov/13285
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Wed, 26 Aug 2026 - 05min - 4244 - Cheap Astronomy - Dear CA #138: In Space!
Some place in space.
Hosted by Steve Nerlich.
Dear Cheap Astronomy – What is the role of AI in space?
AI simulates human decision-making and finds most practical usage in the sorting and analysing of various kinds of data. So. you can feed an AI program pictures of galaxies and the classifications they fit into and then the AI can then identify and classify new ones that you feed it. It's kind of like how Galaxy Zoo used to work, except with Galaxy Zoo it was actual crowd-sourced people that did the work.
Dear Cheap Astronomy – What will space warfare look like?
We've previously discussed on this podcast that fighting a war from space is probably a bad idea. You might conceivably drop a bomb from orbit, but once you've identified yourself as an enemy it's pretty easy to take you out from the ground. You may be able to dodge a few missiles at the start, but once you're out of maneuvering fuel you'll be stuck in a straight-line orbit and hence a sitting duck.
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Tue, 25 Aug 2026 - 14min - 4243 - Astronomy Cast Ep. 101: Advanced Propulsion Systems
From August 11, 2008.
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Last week we talked about rockets. How they work, how they go BOOM!, their limitations. And this week we're going to look at the future of propulsion systems. From the ion engines that are already working to explore the Solar System to the prototype solar sails to futuristic technologies like magnetic sails, and bussard ramjets. This is how we'll travel to other stars.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Mon, 24 Aug 2026 - 36min - 4242 - Travelers in the Night Eps. 369E & 370E: Night Vision & Double Comet
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From December 2025 & January 2026.
Today's 2 topics:
- Many people in our modern world rarely if ever experience night vision. To achieve this interesting state of sensory awareness you cannot look at your cell phone or any other source of bright light for 30 to 45 minutes. Your night vision comes about over time because the rod sensors in the retina of your eye undergo a chemical change when they are placed in total darkness. The process starts immediately but takes 20 to 30 minutes to get 80% of maximum sensitivity. The night vision process can be reversed in seconds by exposure to a bright light. In its most sensitive state your eye can function with a billion times less light than is present in strong sunlight enabling you to see a candle flame from 1.6 miles away.
- In November of 2006, University of Arizona's Spacewatch astronomers on Kitt Peak discovered a faint moving point of light in the night sky which appeared to be a garden variety main belt asteroid orbiting the Sun between Mars and Jupiter. The Minor Planet Center calculated it's orbit and gave it the name 2006 VW139. Five years later when it again moved closest to the Sun the Pan-STARRS group in Hawaii discovered that 2006 VW139 is surrounded by a gas cloud like a comet and it was given a comet designation, 288P.
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Sun, 23 Aug 2026 - 06min - 4241 - Actual Astronomy - Messier Objects for August
Hosted by Chris Beckett & Shane Ludtke, two amateur astronomers in Saskatchewan who enjoy teaching astronomy classes and showing the public views through their telescopes. actualastronomy@gmail.com
On Episode 547 of Actual Astronomy, hosts Chris and Shane guide listeners through observing an array of August Messier objects across the constellations Ophiuchus, Scorpius, and Sagittarius. The show details viewing techniques for globular and open clusters—highlighting targets like the egg-shaped globular M19, the historical Ptolemy's Cluster (M7), and the beginner-friendly M23. Additionally, they explore iconic Milky Way nebulae, including the active star-forming Lagoon Nebula (M8) and the nearby Trifid Nebula (M20) with its distinctive three-lobed dark dust lanes.
1. M10 & M12 (Globular Clusters in Ophiuchus)
- Binoculars: Sweeping through central Ophiuchus reveals these two bright globulars in the same binocular field. They appear as soft, distinct bluishgray spheres.
- Telescope: In an 8-inch telescope, M12 resolves well into individual stars across its core, while M10 appears somewhat more tightly packed, brighter toward the center, and slightly fuzzier at the edges.
- Compare the two side-by-side: Despite being located near each other in our sky, M12 has lost a significant portion of its lower-mass stars due to repeated passages through the Milky Way's dense galactic disk.
2. M107 (Globular Cluster in Ophiuchus)
- Binoculars: A challenging target for binoculars; requires dark skies and averted vision to spot as a minute, faint smudge.
- Telescope: Small-to-medium telescopes reveal a delicate, somewhat un-concentrated patch of light with a loose core.
- M107 contains noticeable dark dust lanes or obscuring regions, which is relatively rare for a globular cluster, giving it a unique visual texture in medium-to-large scopes.
3. M9 (Globular Cluster in Ophiuchus)
- Binoculars: Similar in scale to M107, though slightly brighter and easier to catch in 10x50s on a clear night.
- Telescope: Small scopes show a bright, unresolved central nucleus surrounded by a faint, grainy halo.
- M9 is located remarkably close to the Galactic Centre—only about 5,500 light-years away from it. It lies near dark nebulae like Barnard 64, making the surrounding starfield visually compelling.
4. M19 & M62 (Globular Clusters in Ophiuchus)
- Binoculars: Separated by about 4 degrees, both fit easily into a standard binocular field of view south of M10/M12. They look like round, soft patches brightening toward their centers, with M19 appearing noticeably brighter.
- Telescope: Smaller telescopes show compact, fuzzy disks. Moderate magnification begins resolving outer stars on both.
- M19 is famous for being one of the most distinctly oblate (egg-shaped) globular clusters known, likely due to tidal forces from its proximity to the galactic core.
- M62 has an asymmetric core, heavily deformed by galactic tidal forces, and hosts a rich population of millisecond pulsars.
5. M6 (The Butterfly Cluster) & M7 (Ptolemy's Cluster) Scorpius
- Naked Eye: Both are bright and obvious to the naked eye under dark skies near the "stinger" of Scorpius.
- Binoculars: Binoculars provide the absolute best view. Both clusters fit together in a wide 10x50 field. M7 is larger and brighter; M6 displays a striking butterfly-like star arrangement.
- M7 is one of the oldest recorded deep-sky objects, noted by Ptolemy in 130 AD.
- The orange giant star BM Scorpii, which sits on the wing of the "Butterfly" in M6 and adds a nice pop of stellar color contrast.
6. M8 (The Lagoon Nebula) Sagittarius
- Naked Eye: Appears as a distinct, hazy patch in the Milky Way band above Scorpius.
- Binoculars: Shows as a huge, glowing oval patch—larger than the full Moon—with several bright stars embedded within it.
- Telescope / Filters: A UHC or O-III filter enhances the dark dust lane ("the lagoon") bisecting the bright nebulosity.
- M8 is an active star-forming region containing Bok globules (collapsing clouds of protostellar gas) and the famous "Hourglass Nebula" region at its core.
7. M20 (The Trifid Nebula) Sagittarius
- Binoculars: Located just 1.4 degrees northwest of M8. Appears as a faint, ghostly glow surrounding a central triple/multiple star system.
- Telescope: Medium scopes under dark skies reveal the dark dust lanes splitting the bright emission portion into three distinct lobes.
- M20 is a rare "triple threat" nebula containing an emission nebula (red in photos), a reflection nebula (blue in photos), and a dark dust lane network (Barnard 85) that gives it its name.
8. M21 (Open Cluster) Sagittarius
- Binoculars: Situated right next to M20. Appears as a small, compact, bright knot of stars.
- Telescope: Low-power views easily resolve 20–30 stars packed tightly together.
- The "Trifid Trio": In wide-field eyepieces or binoculars, you can view M8, M20, and M21 all in a single field of view, offering one of the most spectacular Milky Way vistas available to visual observers.
9. M23 (Open Cluster) Sagittarius
- Telescope: Low magnification is key. Small telescopes easily resolve over 80–100 stars spread across a wide field in subtle arc-like patterns.
- M23 sits against a rich background Milky Way star field, making low-power wide-field views ideal. It is an excellent target for beginners practicing star-hopping in northern late-summer skies.
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------------------------------------
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------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sat, 22 Aug 2026 - 24min - 4240 - Space Stories - The Fastest Star in the Milky Way
Hosted by our Director, Avivah Yamani.
Meet S301, the fastest known star in the Milky Way, racing around Sagittarius A* and offering astronomers a new way to measure the spin of our galaxy's supermassive black hole.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Fri, 21 Aug 2026 - 09min - 4239 - EVSN - After Hours: Doing Big Science With Light Tools & Guest Dr. Danny Jacobs
From July 30, 2026.
Hosted by: Dr. Pamela L. Gay (@CosmoQuest)
Science comes from many corners, and there is a need for both 600-m radio telescopes made on a great plain (Like the RATAN-600) and 60cm radio dishes built in a living room. In this After Hours, we talk with ASU professor Dr. Danny Jacobs (https://danielcjacobs.com)about how he engages students of all kinds in space sciences through educational tools like the cardboard radio telescope (https://astrochart.github.io), and in space telescope operations with the SPARCS small sat. (https://sparcs.asu.edu/)
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Thu, 20 Aug 2026 - 1h 02min - 4238 - Awesome Astronomy - The Eclipse & the Perseids
August Part 2.
Paul Hill hosts solo!
Damien Phillips, John Wildridge and Dustin Ruoff produce.
Join Paul in his Astronomy lair as he live sketches the Eclipse, chats to neighbours and talks Astronomy news while spotting Perseid meteors.
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Wed, 19 Aug 2026 - 48min - 4237 - Ask A Spaceman Ep. 278: What's A Good Story About Chandrasekhar?
Physics under pressure!
Hosted by Dr. Paul M. Sutter.
What was the big deal about Chandrasekhar's discovery? Why did he meet so much resistance? How is his work tied to everything from supernovae to black holes? I discuss these questions and more in today's Ask a Spaceman!
Support the show: http://www.patreon.com/pmsutter
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Keep those questions about space, science, astronomy, astrophysics, physics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE!
Big thanks to my top Patreon supporters this month: Justin G, Chris L, Alberto M, Corey D, Michael P, Naila, Sam R, Joshua, Scott M, Rob H, Scott M, Louis M, John W, Alexis, Gilbert M, Rob W, Jessica M, Jules R, Jim L, David S, Scott R, Heather, Mike S, Pete H, Steve S, Lisa R, Kevin B, Aileen G, Deb A, Michael J, Phillip L, Steven B, Mark R, Alan B, Craig B, Richard K, Joe R, David P, Justin, Tracy F, Thomas K, James C, Syamkumar M, Homer V, Mark D, Bruce A, Tim Z, Linda C, The Tired Jedi, Bob C, Stephen A, James R, Allen E, Michael S, Sheryl, David W, Chris, Michael S, Erlend A, James D, Karl W, Den K, Edward K, Scott K, Vivek D, M0PPET, Brad, Azra K, Steve R, M D Malahy, Brian O, Alonna M, Joseph B, and Anders J!
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Tue, 18 Aug 2026 - 38min - 4236 - Astronomy Cast Ep. 118: Sky Surveys
http://www.astronomycast.com/archive/
From December 12, 2008.
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
In the old days, astronomers had to beg for telescope time. They'd put together a proposal, convince observatories to gather data for them, crunch that data and release the results. No telescope, no results. But everything's different now. Fleets of robotic telescopes constantly scan the skies, building up a vast database of raw data about the Universe. Anyone who wants can access the information through the Internet, download what they need to do real science. No telescope necessary. Let's look at the development of sky surveys, and how they're changing how astronomy gets done.
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Mon, 17 Aug 2026 - 30min - 4235 - Travelers in the Night Eps. 367 & 368: Moons of Florence & Roving Venus
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From December 2025.
Today's 2 topics:
- Dr. Lance Benner of NASA's Jet Propulsion Laboratory headed up a team of scientists who used the 70 meter antenna at NASA's Goldstone Deep Space Communications Complex to bounce RADAR beams off of the asteroid Florence as it made a close approach to Earth in September of 2017. The RADAR images these researchers obtained reveal that Florence consists of a 2.8 mile diameter primary asteroid which is orbited by two small moons.
- Venus and Earth are similar in size, composition, density, and mass. Unfortunately, our sister planet Venus is an example of a place where green house gases have created an extreme situation. Venus's thick carbon dioxide atmosphere has a surface pressure 90 times that of Earth. It would crush a submarine. Additionally, the thick atmospheric blanket holds in the heat causing Venus's surface temperature to be 864 F, hot enough to melt lead.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Sun, 16 Aug 2026 - 06min - 4234 - Astroman - E is for Eclipse
Today's episode is all about last Wednesday's total solar eclipse. But you have a partial lunar eclipse that's coming up that you can look forward to on August 27-28!
"ASTROMAN: the Dark Sky Guardian" is a podcast channel that aims to explore popular science in multiple disciplines and research on interdisciplinary approaches, such as sustainability, dark-sky protection, astrophotography, space exploration, astronomy innovation, inclusive science communication, and STEAM Education by integrating science and arts.
Exodus Chun-Long Sit, also known as the ASTROMAN, is a transmedia astronomy educator, popular science author, STEAM educator, and science communicator in Hong Kong. He is recently the National Astronomy Education Coordinator (Chair of Hong Kong, China) of the International Astronomical Union and President of Starrix. He was also an International Committee Member of the Dark Sky International, regularly organizing public lectures at the Hong Kong Space Museum and the Hong Kong Science Museum. He was also the author of a popular science book "Decoding the Starry Night: A Guide to Stargazing and Astrophotography".
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Sat, 15 Aug 2026 - 07min - 4233 - EVSN - After Hours: International Moon Day 2026 With guest Jekan Thanga
Hosted by: Dr. Pamela L. Gay (@CosmoQuest)
From July 22, 2026.
On July 20, the world celebrates International Moon Day. This UN designated holiday marks the anniversary of humanity's first landing on the Moon. The Apollo 11 landing in 1969 is now only a distant memory or a date from history for most people, but it is worth thinking about as the world prepares to return humans to the Moon in the coming decade. Joining us to discuss International Moon Day is Dr. Jekan Thanga, the head of the Space TREx Laboratory at the University of Arizona. Come learn how his interdiciplinary team is taking a page from the past as we plan for a Lunar future.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Fri, 14 Aug 2026 - 59min - 4232 - Guide To Space - Where Do Comets Come From? Exploring the Oort Cloud
https://www.youtube.com/watch?v=IQtdQ94jy8I
From Oct 17, 2017.
Hosted by: Fraser Cain (@frasercain)
Some comets orbit the Sun on a regular basis, but others come in from deep space, a region known as the Oort Cloud. What causes them to make this journey, and will we ever be able to explore the Oort Cloud?
Before I get into this episode, I want to remind everyone that it's been several decades since I've been able to enjoy a bright comet in the night sky. I've seen mind blowing auroras, and witnessed a total solar eclipse with my own eyeballs. The Universe needs to deliver this bright comet for me, and it needs to do it soon.
[Editor's note: Rich here. I'm spoiled by comet Hyakutake.]
By recording this video now, I will summon it. I will create a video that'll be hilariously out of date in a few months, when that bright comet shows up.
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------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Thu, 13 Aug 2026 - 11min - 4231 - Equatorial Sky Guide - August 2026
Hosted by our Director, Avivah Yamani.
Explore the August 2026 equatorial sky, from the Perseids and Milky Way to bright planets and the August 12 total solar eclipse.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Wed, 12 Aug 2026 - 08min - 4230 - Cheap Astronomy - Dear CA Ep. 137: Space Missions
Hosted by Steve Nerlich.
We are still out there.
Dear Cheap Astronomy – Why do some space missions last so long?
So, we're all familiar with the stories of the Mars rovers, Spirit and Opportunity, landing with mission lifespans of 90 days, that then went on to rove the surface of Mars for 15 years. And the Voyager probes, launched in 1977, were supposed to have five-year missions, which are now going on 47 years and counting. So, what's going on? Is NASA just crap at predicting mission lifetimes?
Dear Cheap Astronomy – How much faster is nuclear thermal propulsion?
The idea behind nuclear thermal propulsion or NTP is that you have a nuclear fission core, which is probably uranium-based. This can generate a lot of heat over long periods and you then feed in a propellant that will expand on heating, for example liquid hydrogen. The expanded gas then shoots out a rocket nozzle and pushes your spacecraft forward on the basis of Newton's actions produce opposite reactions.
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Tue, 11 Aug 2026 - 14min - 4229 - Astronomy Cast Ep. 160: Eclipses
http://www.astronomycast.com/archive/
From October 19, 2009.
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Every now and then, the Moon destroys the Sun. Okay, not destroys, covers. Well, not really covers, but from here on Earth, sitting inside the shadow of the Moon, that's what it sure looks like. These events are called eclipses, or more precisely, transits and occultations. They occur whenever one object passes in front of another from a 3rd perspective. They're beautiful and exciting, and deliver a tremendous amount of science as well.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Mon, 10 Aug 2026 - 33min - 4228 - Travelers in the Night Eps. 365E & 366E: Spotting Meteors & Mars Rocks
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From December 2025.
Today's 2 topics:
- Meteors, shooting stars, or falling stars are different names for the streaks of light in the night sky which are in reality the dying embers of tiny asteroids. These small interplanetary travelers were speeding along at between 7 and 44 miles per second when they entered the Earth's atmosphere. In space, they are called meteoroids and typically ranged in size from that of a grain of sand to perhaps ones as big as of a piece of driveway gravel. Large space pebbles can produce fireballs which are brighter than the planet Venus.
- At about 2AM on July 18, 2011 several people in near Tata, Morocco saw a bright fireball which was described by one of them to be initially yellow, then turned green, and finally exploded into several pieces producing two sonic booms. In October of 2011 desert wandering nomads began finding very fresh looking dark fusion-crusted stones which were radioactively dated by Dr. John Duke of the University of Alberta to be less than 5 years old. In total 15-24 lbs of meteorites consistent with a very recent fall were found in a strewn field, were whisked away to receive high prices from collectors, and named after the town of Tissint, about 30 miles from their discovery location.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Sun, 09 Aug 2026 - 06min - 4227 - NOIRLab - The Start of the LSST
Hosted by Rob Sparks.
The 10-year Legacy Survey of Space and Time has officially started, marking the beginning of a new era in astronomy and astrophysics. Over the next ten years, Rubin will relentlessly observe the entire southern sky every few nights to create an ultra-wide, ultra-high-definition time-lapse record of our Universe. This long-awaited milestone is the culmination of years of effort by thousands of people around the world. In this podcast, Dr. Christina Williams and Dr. Yumi Choi describe the LSST and its science goals as well as what they are most excited about researching with its groundbreaking data.
Bios:
- Rob Sparks is in the Communications, Education and Engagement group at NSF's NOIRLab in Tucson, Arizona.
- Dr. Yumi Choi is an Assistant Astronomer at NSF NOIRLab. Her research focuses on understanding the formation and evolution of nearby galaxies. Her primary work utilizes high-precision, multi-band photometry to analyze resolved stellar populations in those galaxies. Beyond my independent research programs, she is a dedicated member of the Rubin Observatory Community Science Team.
Dr. Choi earned her PhD in Astronomy from the University of Washington in 2016. She subsequently held postdoctoral research positions at the University of Arizona's Steward Observatory, Montana State University, and the Space Telescope Science Institute (STScI). Prior to her current appointment at NSF NOIRLab in 2023, she spent a year as an Assistant Researcher at the University of California, Berkeley.
- Dr. Christina C. Williams is an Associate Astronomer at NSF NOIRLab in Tucson, Arizona And an Assistant Research Professor at University of Arizona and a member of the James Webb Space Telescope (JWST) NIRCam instrument and science teams. Her research focuses on high-redshift galaxies, galaxy evolution, and star formation in the early Universe.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Sat, 08 Aug 2026 - 12min - 4226 - EVSN - After Hours: Space Rocks Collected for Science With Guest Dr. Rhonda Stroud
From July 15, 2026.
Hosted by: Dr. Pamela L. Gay (@CosmoQuest)
Our solar system readily provides us with free samples of other worlds in the form of meteorites. The trick comes in first recognizing them, and then in understanding what science is locked in their minerals. One major center for collecting and studying these space rocks is Arizona State University's Buseck Center for Meteorite Studies which houses the Carleton B. Moore Meteorite Collection. Join us as we discuss the collection with Director Rhonda Stroud.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Fri, 07 Aug 2026 - 52min - 4225 - Actual Astronomy - The Observer's Calendar for August 2026
Hosted by Chris Beckett & Shane Ludtke, two amateur astronomers in Saskatchewan who enjoy teaching astronomy classes and showing the public views through their telescopes. actualastronomy@gmail.com
Episode 545 of the Actual Astronomy podcast features hosts Chris and Shane discussing the observer's calendar and planetary visibility for August 2026. Throughout the month, skywatchers can track key planetary positions, including Venus in the morning sky and Jupiter rising around 3:00 AM. Notable astronomical highlights include the Perseid meteor shower, multiple lunar feature viewings, and a partial lunar eclipse accompanying the Full Moon on August 28th.
Planet Positions & Visibility:
- Mercury: Very close to the Sun. Superior conjunction on the 27th.
- Venus: In W, evening sky all month.
- Mars: Rises at 3 AM in ENE.
- Jupiter: Hidden behind the Sun at the start of Aug. Will rise around 5 AM by the end of month.
- Saturn: Rises in E around midnight, transits around 5:00 AM, high in SSE at dawn.
Astronomical Events by Date:
- August 2
- Mercury at greatest morning elongation (19° from Sun)
- Comet 10P/Tempel 2visible at 2:25 AM
- Image for when moon leaves in second week of Aug.
- August 3
- Lunar Feature (Mare Orientale) visible at 4:45 AM
- Carbon star RS Cyg best in evening
- August 5
- Last Quarter Moon at 22:21
***August 5 Falcon 9 Upper Stage lunar impact anyone?***
- August 9
- Mars 4° SW of crescent Moon before dawn.
- Star cluster NGC 6791 well placed this evening
- August 10
- Moon at perigee
- Wild Duck Cluster (M11) well placed this evening
- August 11
- Mercury 2° South of Moon, just before dawn.
- Globular clusters M22 and M28 well placed this evening
- August 12
- New Moon at 13:37 — Partial solar eclipse for US east coast.
- Perseid meteors (ZHR=100), late evening, but best seen after midnight
- August 16
- Venus 9° W of Moon
- August 19
- First Quarter Moon at 22:46
- Lunar feature Barrow Ray visible at 8:30 PM
- Carbon star S Sct best in evening
- August 23
- Lunar feature Jeweled Handle visible at 12:00 AM
- Carbon star V CrB best in evening
- August 26
- Crater Bailly visible at 10:00 PM
- 57 Aql (colorful double star) visible
- August 28th
- Full Moon: Occurs at 0:19.
- Partial (96%) Lunar Eclipse
- 9 Metis at Opposition: Visible at magnitude m = 9.3 The asteroid was discovered on April 25, 1848, by Irish astronomer Andrew Graham. It was his only asteroid discovery and holds historical significance as the only asteroid ever discovered from an observatory in Ireland (the Markree Observatory). Scientists believe 9 Metis has a cataclysmic history. It is highly dense and rich in metals, leading researchers to conclude that it is likely the core remnant of an ancient, much larger primordial asteroid. This parent body was completely destroyed and stripped of its outer crust by a colossal space collision billions of years ago.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Thu, 06 Aug 2026 - 27min - 4224 - Ask A Spaceman Ep. 277: What's It Like to Travel Near the Speed of Light?
Life at lightspeed!
Hosted by Dr. Paul M. Sutter.
What does high-speed motion through the Universe do to your perspective? What is the Rindler horizon, and how does it appear? Would you get vaporized by a high-energy bath of radiation? I discuss these questions and more in today's Ask a Spaceman!
Support the show: http://www.patreon.com/pmsutter
All episodes: http://www.AskASpaceman.com
Watch on YouTube: http://www.youtube.com/PaulMSutter
Read a book: https://www.pmsutter.com/books
Keep those questions about space, science, astronomy, astrophysics, physics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE!
Big thanks to my top Patreon supporters this month: Justin G, Chris L, Alberto M, Corey D, Michael P, Naila, Sam R, Joshua, Scott M, Rob H, Scott M, Louis M, John W, Alexis, Gilbert M, Rob W, Jessica M, Jules R, Jim L, David S, Scott R, Heather, Mike S, Pete H, Steve S, Lisa R, Kevin B, Aileen G, Deb A, Michael J, Phillip L, Steven B, Mark R, Alan B, Craig B, Richard K, Joe R, David P, Justin, Tracy F, Thomas K, James C, Syamkumar M, Homer V, Mark D, Bruce A, Tim Z, Linda C, The Tired Jedi, Bob C, Stephen A, James R, Allen E, Michael S, Sheryl, David W, Chris, Michael S, Erlend A, James D, Karl W, Den K, Edward K, Scott K, Vivek D, M0PPET, Brad, Azra K, Steve R, M D Malahy, Brian O, Alonna M, Joseph B, and Anders J!
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Wed, 05 Aug 2026 - 25min - 4223 - Awesome Astronomy - August Part 2: Jodrell Bank Murder Club
Paul Hill and Dr. Jenifer "Dr. Dust" Millard host.
Damien Phillips, John Wildridge and Dustin Ruoff produce.
Angry episode where Paul and Jeni have their blood boiled by the decision to defund Jodrell Bank Observatory and the plans to launch over a million satellites, thousands of which will be brighter then the full moon!
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Tue, 04 Aug 2026 - 1h 13min - 4222 - Astronomy Cast Ep. 85: Detectors
http://www.astronomycast.com/archive/
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
From April 21, 2008.
Our senses can only detect a fraction of the phenomena happening in the Universe. That's why scientists and engineers develop detectors, to let us see radiation and particles that we could never detect with our eyes and ears. This week we'll go through them all, so you can understand how we see what we can't see.
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Mon, 03 Aug 2026 - 31min - 4221 - Travelers in the Night Eps. 363E & 364E: House Sized Space Rocks & Jupiter
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From November 2025.
Today's 2 topics:
- Throughout history small close approaching space rocks have been a part of our environment. Now, thanks to improved telescopes and cameras, asteroid hunters are routinely discovering these small asteroids as they pass closer than the Moon is to us. Since these tiny asteroids are only bright enough to detect for a few days out of their long, many month duration paths about the Sun, astronomers have had difficulty in determining how many of these small space rocks may exist in near Earth space. This effort received more emphasis when a house sized space rock exploded over Chelyabinsk, Russia in 2013 releasing about 10 times the energy of the Hiroshima atomic bomb.
- Jupiter has been observed throughout human history and is so bright that you can even spot it under the artificial light dome of one of our cities. Even so it is less than 40 years ago that we were first able to view Jupiter in detail as the Voyagers streaked by it. Jupiter contains more than twice the mass of all of the other planets, dwarf planets, asteroids, and comets in our solar system combined. Eons ago, our solar systems very own giant planet, Jupiter, appears to have cleared out the inner solar system leaving enough rocky debris to form Mercury, Venus, Earth, and Mars.
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Sun, 02 Aug 2026 - 06min - 4220 - Space Stories - Betelgeuse Was Never Alone
Hosted by Avivah Yamani, our Director!
Was Betelgeuse ever truly alone? For over 100 years, astronomers searched for a hidden companion to Orion's famous red supergiant. Now, new observations from ESO's Very Large Telescope have revealed the clearest evidence yet that Betelgeuse has a stellar companion. Discover the science, the mystery, and why this finding is changing our understanding of one of the sky's most famous stars.
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Sat, 01 Aug 2026 - 08min - 4219 - EVSN - Betelgeuse Smaller Than Previously Calculated, Still A Mystery
From February 10, 2021.
Hosted by Dr. Pamela L. Gay.
Scientists collected fresh data on Orion's bright star Betelgeuse to try and understand this star that caused so much controversy. They found it's smaller than previously calculated, and last year's dimming was likely caused by dust, but it's also more complex than thought. Plus, galaxies, Earth's forests, ice on Mars, and Saturn's moon Rhea.
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Fri, 31 Jul 2026 - 22min - 4218 - UNAWE Space Scoop - A Blazing Hot World With A Buzzing Secret
https://spacescoop.org/en/scoops/2608/a-blazing-hot-world-with-a-buzzing-secret/
Hosted by our editor, Richard Drumm.
Far, far away from Earth, over 300 light-years away, is an incredible exoplanet called WASP-189b, in the constellation Libra, the scales. It lies a bit to the NW of Beta Librae, or Zubeneschamali, and almost exactly due north of the Libra star with my favorite star name: Zubenelgenubi! WASP-189 is the star & 189b is the planet.
It has about twice Jupiter's mass and about 1 1/2 times its diameter. It orbits its star in 2 days & 17 hours, so it's really close in! But this isn't just any old planet. 189b is a giant, blazing-hot world with a secret that has astronomers buzzing with excitement!
Ah, that's where the buzzing in the title comes from!
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Thu, 30 Jul 2026 - 07min - 4217 - Guide To Space - Betelgeuse Is Still Dimming! And We Have the Pictures to Prove It
https://www.youtube.com/watch?v=gC4LEozmqXE
From Feb 16, 2020.
Hosted by Fraser Cain.
Near the end of 2019, astronomers watching the red giant Betelgeuse noted how much the star had dimmed, continuing to steadily fade for months. It's a variable star, and it's known to get dimmer and brighter, but the big surprise is that it's still continuing to dim, recently passing magnitude 1.56 and still getting dimmer. This is unprecedented in the decades that astronomers have been watching the star.
The world's biggest telescopes are on the case, and the European Southern Observatory released dramatic new images of Betelguese, resolving features on the star's surface and surrounding area showing how it's dramatically changed over the course of 2019.
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
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Wed, 29 Jul 2026 - 08min - 4216 - Awesome Astronomy - Eclipse Girl Summer!
July Part 2!
Paul Hill & Dr. Jenifer "Dr. Dust" Millard host.
Damien Phillips, John Wildridge and Dustin Ruoff produce.
Summer is here, so is the heat and so is the Eclipse! Chat, tips and hints about August's Eclipse and the Perseid meteor shower, as well as summer vibes, emails and Jeni dressing up as Max Wall.
Link:
https://github.com/marcel-jan/inkystarmap
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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Tue, 28 Jul 2026 - 1h 10min - 4215 - Astronomy Cast Ep. 89: Adaptive Optics
http://www.astronomycast.com/archive/
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
From May 19, 2008.
Since the dawn of humanity, astronomers have wished to destroy the atmosphere. Oh sure, it's what we breathe and all, but that stupid atmosphere is always getting in the way. Since destroying the atmosphere is out of the question, astronomers have figured out how to work with it. To distort the mirror of the telescope itself though the magic of adaptive optics.
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Mon, 27 Jul 2026 - 30min - 4214 - Travelers in the Night Eps. 361E & 362E: Newest Moon & Tiny Beasts
Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org
From November 2025.
Today's 2 topics:
- The moon cycle from new moon through full moon and back to new moon again was used by many nations to regulate their activities and forms the basis of the Islamic lunar calendar. A calendar based on the first visibility of the lunar crescent is difficult to predict in advance since this observation depends on the clarity of the atmosphere and other local conditions. The interesting observational problem of when it is possible to spot the new moon has been analyzed in the scientific literature as an aid to historians who are seeking to interpret the writings of ancient civilizations.
- Humans have a long history of partnerships with a variety of micro organisms. Although the proportions vary widely with individuals, recent scientific estimates suggest that a typical human being has approximately the same number of bacteria and other microbes as they do actual human cells. Now it appears that a partnership with yeast and algae will enable spacefaring humans to use their waste products to produce food and plastics during long duration space flights.
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
------------------------------------
The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.
Sun, 26 Jul 2026 - 06min
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