Planetary Radio: Space Exploration, Astronomy and Science

The Planetary Society’s 2026 STEP Grant winners are building tools to characterize asteroids and trans-Neptunian objects: a replicable polarimeter, a public photometry database, and an occultation prediction platform scaled for the Rubin era.

Former astronaut Leroy Chiao is our guest for a conversation about his book, “Dinner With an Astronaut,” and a lifetime of accomplishments on and off the planet.

Japan’s MMX mission is about to launch for the moons of Mars, carrying a sampler with deep Planetary Society roots. Asa Stahl, public outreach astronomer at The Planetary Society, and Kris Zacny, vice president and senior research scientist at Honeybee Robotics, tell the story.

Jack Kiraly, chief of advocacy for The Planetary Society, and planetary scientist Britney Schmidt join Casey Dreier to examine NASA’s push toward “science as a service,” and why science is so much more than buying data.

More conversations from the 2026 NIAC Symposium, this time about the propulsion and life support breakthroughs that could carry us to the outer Solar System and keep us alive when we get there.

Researchers at the 2026 NIAC Symposium share their bold concepts for exploring the most inaccessible places in our Solar System, from the Moon's permanently shadowed craters to caves on Titan and inside lunar lava tubes.

NASA Chief Scientist for Small Body Exploration at Johnson Space Center, Paul Abell, takes us inside Hayabusa2's flyby of asteroid Torifune and the surprise discovery that it's a contact binary.

Planetary scientist Kevin Hand joins us for a deep exploration of his excellent book about the search for life in the oceans of other worlds.

In part two of our Star Trek 60th anniversary series, Tim Russ, Tuvok from Star Trek: Voyager, and Karim Diané, Jay-Den Kraag from Star Trek: Starfleet Academy, explore what the Vulcans and the Klingons can teach us about becoming the people who deserve to reach the stars.

Robert Picardo, the Emergency Medical Hologram from Star Trek: Voyager and now Starfleet Academy, traces the sixty-year bond between Star Trek and The Planetary Society, from Gene Roddenberry's 1980 letter to the halls of Congress.

Alex MacDonald, former Chief Economist at NASA and author of "The Long Space Age," joins Casey Dreier to explore more than two centuries of privately funded space exploration in America.

Dennis Stone, president and co-founder of the World Space Week Association, shares how the largest annual space event on Earth came to be and how you can join the celebration this October. Plus, Science Editor Asa Stahl walks us through the final chapter of the Swift space telescope.

The Nancy Grace Roman Space Telescope is preparing to launch, promising to transform our understanding of dark energy and exoplanets. We talk with Julie McEnery, senior project scientist for Roman at NASA Goddard, and Jason Rhodes, project scientist for Roman at JPL, about what's ahead.

How will living in space change our bodies and minds? That’s the sub-title of Scott Solomon’s great new book, “Becoming Martian”, and it’s the question he takes up this month on the book club edition of Planetary Radio.

Jared Head, museum facilitator at Columbia Memorial Space Center and co-host of All Space Considered at Griffith Observatory, breaks down how a SpaceX Falcon 9 upper stage ended up crashing into the moon. Plus, Planetary Society staff reflect on the 2026 total solar eclipse in Spain and share an update on the fight to save NASA science.

Astrophotographer Andrew McCarthy and bioacoustics researcher David Mann, join Planetary Radio to talk about the August 12th total solar eclipse and how birds responded to totality.

Casey Dreier is joined by Zach Pirtle, deputy director of the Consortium for Science, Policy and Outcomes at Arizona State University, and the Planetary Society's Chief of Advocacy Jack Kiraly to dissect the White House's "Science: A New Golden Age" report, which calls for a sweeping reimagining of how the U.S. funds and conducts science.

Collin Cherubim, NASA Hubble Fellow at the University of Chicago, discusses his team's detection of an atmosphere on LHS 1140b, the first rocky exoplanet in a star's habitable zone confirmed to have one.

A team of University of Maryland students is building a CubeSat to fly past asteroid Apophis during its historic close approach to Earth in 2029. Four members of the TERP RAPTOR team join us to share how they're turning a classroom project into a real space mission.

Research Scientist Tiffany Kataria of NASA JPL and Assistant Professor Lisa Dang of the University of Waterloo talk about two extreme hot Jupiters from the American Astronomical Society meeting.

Theoretical physicist Chanda Prescod-Weinstein visits the club for a mind-bending conversation about her brilliant, deeply personal exploration of the Cosmos.

Commercial space astronaut Sian Proctor and astronomer John Read join Planetary Radio to discuss “Baby's Guide to the Night Sky,” their new book introducing the youngest children to constellations and the wonders of the Cosmos.

Green Bank, West Virginia bans cell phones and Wi-Fi so its giant radio telescope can listen undisturbed. This week, Senior Communications Advisor Mat Kaplan talks with director Katie Dellamaggiore and physicist Ellie White about the documentary Small Town Universe, and Public Education Specialist Kate Howells previews August's total solar eclipse.

Clayton Swope, deputy director of the Aerospace Security Project and senior fellow at CSIS, joins the show to break down NASA's rocky path toward a commercial replacement for the International Space Station.

The European Space Agency's Rosalind Franklin rover finally has a path to Mars. ExoMars Project Scientist Jorge Vago joins Planetary Radio to discuss the rover's 2-meter drill, its onboard astrobiology lab, and what it would mean to finally find evidence that Mars was once home to life.

China’s Tianwen-2 mission has arrived at the quasi-moon Kamoʻoalewa. We sit down with Planetary Society contributing editor and freelance space journalist Andrew Jones to explore what this ambitious sample-return mission could reveal about our Solar System's history.

Hugo and Locus-winning author Becky Chambers talks with Mat Kaplan about “To Be Taught, If Fortunate,” her outstanding novella. It’s a passionate plea for space science and exploration told across the interstellar journey of four equally passionate human voyagers.

NASA's Dragonfly mission is sending a car-sized, nuclear-powered rotorcraft to Saturn's moon Titan. Lead rotor engineer Felipe Ruiz and principal investigator Zibi Turtle from Johns Hopkins Applied Physics Laboratory join us to discuss the engineering of flight on Titan with just two years to launch.

Jack Kiraly, The Planetary Society's director of government relations, joins Sarah Al-Ahmed to discuss proposed grant rule changes that could upend U.S. science funding, a major NASA reorganization, and the fallout from the destruction of Blue Origin's New Glenn rocket.

Casey Dreier is joined by Liz Ginexi, a former Program Officer at the U.S. National Institutes of Health, to break down a 400-page proposed rule change from the U.S. Office of Management and Budget that could fundamentally reshape how the federal government manages scientific grants.

Colonel Eileen Collins, the first woman to pilot and command a Space Shuttle, joins us to discuss “Spacewoman,” the new documentary telling the story of her extraordinary life and career.

The Los Angeles Astronomical Society is one of the oldest and largest amateur astronomy clubs in the United States, and this year it’s turning one hundred. We were there at Griffith Observatory for the centennial celebration to find out what keeps a community of skywatchers going for a century.

Amy Williams, astrobiologist and associate professor at the University of Florida, discusses a landmark experiment that revealed more than 20 organic molecules preserved in ancient Martian rock. We explore what this chemical discovery tells us about Mars' ancient habitability.

Celebrated author and poet Diane Ackerman joins us for a lively conversation about the new edition of her wonderful collection. Carl Sagan described it as spectacularly good poetry.

For the first time, the Planetary Society's annual Day of Action was followed by Igniting Discovery, a showcase of the NASA-funded science we're fighting to protect, held in the US Senate building.

The fight to save NASA science is back. Planetary Radio host Sarah Al-Ahmed takes you to Washington, D.C., for the 2026 Day of Action, where Planetary Society members, scientists, and advocates hit Capitol Hill to oppose a proposed 46% cut to NASA's science budget.

Casey Dreier, chief of space policy at The Planetary Society, sits down with Rebecca Lowe, philosophy senior fellow at the Mercatus Center at George Mason University, to explore why human presence in space is so different from robotic missions, and why that difference matters.

At Yuri's Night 2026, held at Griffith Observatory the day after Artemis II splashed down, Sarah Al-Ahmed spoke with educators, engineers, astronauts, and space philosophers about 65 years of human spaceflight and what it means to see Earth from space.

“Project Hail Mary” has arrived on the big screen, and we're diving into the real science behind Andy Weir's latest blockbuster with senior communications adviser Mat Kaplan, award-winning Nature correspondent Alexandra Witze, Virginia Tech astrophysicist Nahum Arav, and Planetary Society chief scientist Bruce Betts.

Sir Peter Beck adds to the story told about his hugely successful and innovative company in “The Launch of Rocket Lab,” a beautifully illustrated, monumental book.

The Artemis II crew has returned home safely after a historic journey around the Moon. We celebrate some of the most extraordinary moments from the mission. Meanwhile, back on Earth, the new Presidential Budget Request proposes a 47% cut to NASA's science budget, threatening 84 missions.

Four astronauts are on their way around the Moon for the first time in over 50 years. This week on Planetary Radio we bring you the sounds of launch day and the voices of the people who made it happen.

Casey Dreier, chief of space policy at The Planetary Society, sits down with Stephen C. Smith, author of Return to Launch and Kennedy Space Center Visitor Complex communicator, to explore how a remote Florida peninsula became the heart of U.S. spaceflight.

Lisa Carnell, Director of NASA's Biological and Physical Sciences Division, explains AVATAR, the experiment flying organ chips grown from astronaut cells on Artemis II. Then, asteroid hunter Alain Maury tells the story of discovering a sungrazing comet that could become one of the most spectacular in decades.

Steve Platts, chief scientist of NASA’s Human Research Program, walks us through the health experiments aboard Artemis II, followed by Planetary Society Chief of Space Policy Casey Dreier on NASA's Ignition Day announcements.

Astrobiologist Caleb Scharf eloquently explores the future of humanity and what we will become when we live beyond Earth.

As humanity heads back to the Moon, Europe is stepping up. We bring you voices from the European Space Conference and take you inside the Moonlight Initiative panel building the Moon’s future.

Gentry Lee, the subject of the new documentary “Starman,” reflects on nearly five decades at JPL, the missions that defined the Space Age, and the search for life beyond Earth.

NASA has restructured the Artemis program, shifting Artemis III from a planned lunar landing to a low-Earth-orbit systems test following the rollback of Artemis II. We hear remarks from NASA leadership and break down what the changes mean with Planetary Society space policy experts.

A new study explores whether a massive ancient impact briefly triggered cryovolcanism on Uranus’s moon Umbriel. Sarah Al-Ahmed speaks with Adeene Denton about how crater modeling reveals clues to the moon’s hidden interior.

Bruce Betts helps us explore the latest and last in his excellent library of space books for young people. He and host Mat Kaplan take up “Are We Alone?” and “The Size of Space.”

A new chapter begins at The Planetary Society as Jennifer Vaughn becomes CEO and Bill Nye steps into his new role as chief ambassador.

Scientists are using Apollo Moon dust to trace where Earth’s water came from and how our planet became habitable. Planetary scientist Tony Gargano explains how lunar samples reveal the history of ancient impacts, with a short bonus reflection from George Takei on “Star Trek” and the Artemis era.

Chief of Space Policy Casey Dreier and Director of Government Relations Jack Kiraly break down what NASA authorization bills actually do and why these laws matter for long-term U.S. space policy, from science missions to human spaceflight and planetary defense.

New research suggests the seafloor beneath Europa’s vast ocean may be geologically quiet today, reshaping how scientists think about habitability on one of the Solar System’s most intriguing ocean worlds. Planetary geologist Paul Byrne of Washington University in St. Louis joins Planetary Radio to discuss.

This week on Planetary Radio, Sarah Al-Ahmed is joined by Kelsey Young, Artemis Science Flight Operations Lead and lead of the Artemis II Lunar Observations and Imaging Campaign, and Noah Petro, project scientist for Artemis III. Together, they explore how geology and human observation are shaping humanity’s return to the Moon.

Congress has passed a budget that restores near-full funding for NASA science after months of uncertainty. We break down what was saved, what was lost, and what comes next.

The delightful astrophysicist and science communicator Adam Frank shares his thoughts about the search for life and intelligence across the Universe in the Planetary Society’s member book club.

Host Sarah Al-Ahmed speaks with David McComas, principal investigator of IMAP and IBEX, and Matina Gkioulidou, IMAP project scientist, about how energetic neutral atoms let us map the heliosphere.

Linda Spilker, project scientist for the Voyager mission, explains what Voyager has revealed about the heliopause and the Solar System’s outer edge.

After DOGE cuts, mass staff departures, and a blink-and-you-missed-it pivot to Mars, how much did NASA actually change in 2025? Space Policy Online founder Marcia Smith returns to assess a turbulent year.

Planetary Radio looks back at the biggest space exploration stories of 2025, from stunning images and major missions to hard lessons about how science moves forward. Host Sarah Al-Ahmed is joined by members of The Planetary Society’s communications team to reflect on what defined the year, and what they’re most excited to see in 2026.

As NASA faces unprecedented proposed cuts to its science programs, Planetary Radio looks back at a pivotal year for U.S. space policy and advocacy. The Planetary Society’s space policy team unpacks what happened, why funding uncertainty matters, and what comes next for space science.

The Planetary Society’s Kate Howells has written this beautifully illustrated trek among our Solar System’s most intriguing and mysterious moons.

Thirty years after NASA’s Galileo spacecraft became the first to orbit Jupiter, scientists and engineers gathered to reflect on the mission that transformed how we see the giant planet and its moons.

Why do we explore space? In this Space Policy Edition rerun, Casey Dreier speaks with philosopher Dr. J. S. Johnson-Schwartz about why space science is a moral obligation, beyond economics or prestige.

Mat Kaplan brings us to USC for the 2025 Mars Society Convention, where leaders in science, engineering, AI, biology, architecture, and advocacy share bold visions for humanity’s future on Mars.

NASA’s ESCAPADE mission is on its way to Mars to study how the solar wind interacts with the planet’s magnetic fields and atmosphere. This week, we talk with Ari Koeppel and PI Rob Lillis about the mission’s launch and science goals, and examine Martian aurora in What’s Up.

Planetary Radio shares Casey Dreier’s appearance on Smart Girl Dumb Questions, where he and host Nayeema Raza explore why space exploration matters and whether NASA’s budget is worth the cost.

Author David Baron has written the definitive, true story of a time when nearly everyone in America was utterly convinced there was a supremely intelligent civilization on the Red Planet, and they wanted to talk with us!

This week, Planetary Radio explores how Epic Spaceman uses visual effects and everyday metaphors to make the vast scale of the Universe feel human and understandable.

The Planetary Society visits TwitchCon 2025 to explore how livestreamers like Moohoodles are bringing space science to new audiences. The episode also features a Space Policy Update on Jared Isaacman’s renomination as NASA Administrator and celebrates the third anniversary of the LightSail 2 mission with Bruce Betts.

In 1996, a controversial claim of fossilized life in a Martian meteorite ignited a golden age of Mars exploration. Nearly 30 years later, a potential biosignature detected by the Perseverance rover at Jezero Crater has sparked…no major policy changes. Why? Lou Friedman joins the show to present his view.

Physicist Daniel Whiteson and cartoonist Andy Warner join Sarah Al-Ahmed to explore their new book, “Do Aliens Speak Physics?”

Historian Dagomar Degroot joins Planetary Radio to discuss his new book, “Ripples on the Cosmic Ocean: An Environmental History of Our Place in the Solar System,” which reveals how events across the Solar System have shaped life on Earth.

Planetary Radio continues its coverage from the 2025 NASA Innovative Advanced Concepts Symposium in Philadelphia, highlighting technologies that could shape future missions, from detecting exoplanet magnetospheres to exploring Venus and Saturn’s moon Enceladus with innovative robots.

Space Craze author Margaret Weitekamp of the National Air and Space Museum documents our fascination with all things space, as evidenced by the pop culture artifacts she lovingly oversees in the collection.

Planetary Radio explores visionary ideas from NASA’s Innovative Advanced Concepts Symposium. In this first of two episodes, discover how researchers are turning science fiction into reality, from glass habitats on the Moon to starshades that could reveal new Earths.

Hundreds of advocates joined The Planetary Society and partner organizations in Washington, D.C., to urge Congress to protect NASA’s science budget. Hear from Ari Koeppel, Britney Schmidt, Bill Nye, Rep. Glenn Ivey, Marcel Agüeros, Brandon Jones, and Casey Dreier about this historic Day of Action.

If the United States is indeed in a space race with China, why are we abandoning space science programs across the Solar System? This question, posed by guest Maxwell Zhu in a recent op-ed co-authored by The Planetary Society’s chief of space policy, reveals the current myopia around human spaceflight and the missing focus on a growing and ambitious new entrant into space science in the 21st century.

NASA’s Perseverance rover has found potential biosignatures in Jezero Crater’s Bright Angel formation. Host Sarah Al-Ahmed speaks with Joel Hurowitz, associate professor of geosciences at Stony Brook University and lead author of the new Nature paper, about this remarkable discovery.

Bill Nye, CEO of The Planetary Society, celebrates his new star on the Hollywood Walk of Fame and joins us to reflect on its meaning. We also receive the latest space policy updates as NASA faces significant budget challenges.

Author and historian of science Dava Sobel talks about her many wonderful books with The Planetary Society’s Mat Kaplan. Dava recently received the Society’s Cosmos Award.

Join host Sarah Al-Ahmed and Mark McCaughrean, adjunct scientist at the Max Planck Institute for Astronomy, for a tour of “111 Places in Space That You Must Not Miss”, a cosmic travel guide to the Universe.

Host Sarah Al-Ahmed speaks with Staci Horvath, outreach coordinator at NASA Goddard Space Flight Center and director of International Observe the Moon Night, and Theresa Summer, astronomy educator at the Astronomical Society of the Pacific, about the history and global impact of International Observe the Moon Night.

Atlantic writer Franklin Foer joins the show to discuss how NASA enabled the rise of Elon Musk, and, in doing so, sowed the seeds of its own decline.

Michael Roman, assistant professor at the Universidad Adolfo Ibáñez in Chile, joins Sarah Al-Ahmed to discuss new research confirming that Uranus radiates excess heat, finally resolving a decades-long mystery first sparked by Voyager 2.

What happens when pro gaming and space science collide? Kyle Hill, head of science education and outreach for the esports team BASILISK, joins us to share how the team is inspiring the next generation of scientists.

JWST has uncovered silicate clouds and a dusty circumplanetary disk in the YSES-1 system. Kielan Hoch and Emily Rickman from the Space Telescope Science Institute join us to explore what these surprising findings reveal about young giant exoplanets.

Frank White is the author of “The Overview Effect: Space Exploration and Human Evolution. “ Now in its fourth edition, the book has crystallized and expanded on the profound sense of wonder and oneness experienced by nearly all astronauts.

Star Trek actors Robert Picardo and Tim Russ join Planetary Society staff members Ambre Trujillo and Andrew Pauly at STLV, a “Star Trek” convention, to explore how “Star Trek” inspires real-world space advocacy.

Astronomers have discovered a new interstellar comet, 3I/ATLAS, the third object ever seen entering our Solar System from another star. We speak with Bryce Bolin, research scientist at Eureka Scientific, about what makes this visitor unique and what it can teach us about other worlds.

Dr. Bhavya Lal argues that the 2020s are a decisive decade for in-space nuclear power. Without nuclear, humans may never be more than visitors on Mars or the Moon.

Erin Flynn-Evans, director of the Fatigue Countermeasures Laboratory at NASA Ames Research Center, shares how sleep science is helping astronauts stay healthy in space and prepare for future missions to Mars.

New Horizons Principal Investigator Alan Stern joins us to celebrate the Pluto flyby’s 10th anniversary, with updates from planetary scientist Adeene Denton and Planetary Society Director of Government Relations Jack Kiraly. Plus, a look at Arrokoth in What’s Up with Bruce Betts.

Bestselling science fiction author Andy Weir joins The Planetary Society’s Mat Kaplan for a deeply fascinating and very entertaining conversation about his #1 bestselling novel, Project Hail Mary, soon to be a major motion picture.

Former Planetary Radio host Mat Kaplan joins Space for Humanity and Zero-G for a flight that brings weightlessness and wonder to a diverse group of space dreamers. Hear voices from the flight and reflections on what it means to open space to everyone.

The Rubin Observatory releases its first public images, revealing millions of celestial objects. We explore the science with Stephanie Deppe, astronomy content strategist at Rubin Observatory.