
Planetary Radio: Space Exploration, Astronomy and Science
Planetary Radio brings you the human adventure across our Solar System and beyond. We visit each week with the scientists, engineers, leaders, advocates, and astronauts who are taking us across the final frontier. Regular features raise your space IQ while they put a smile on your face. Join host Sarah Al-Ahmed and Planetary Society colleagues including Bill Nye the Science Guy and Bruce Betts as they dive deep into space science and exploration. The monthly Space Policy Edition takes you inside the DC beltway where the future of the US space program hangs in the balance. Visit planetary.org/radio for an episode guide and much more.
Latest episodes

Jun 30, 2021 • 57min
Finding Life by Looking for Complexity
University of Glasgow chemist Lee Cronin and his collaborators have developed a new way to detect life. Their "assembly theory" could give us a reliable method for recognizing life or evidence of past life based on the complexity of molecules in any environment. The Planetary Society’s Rae Paoletta shares our favorite images of Saturn’s rings with Mat. Bruce Betts reveals which star takes up more of Earth’s night sky as he resolves another What’s Up space quiz. Discover more at https://www.planetary.org/planetary-radio/lee-cronin-assembly-theorySee omnystudio.com/listener for privacy information.

Jun 23, 2021 • 53min
The Pearly Clouds of Mars
Planetary scientist Mark Lemmon discusses the stunning images of iridescent clouds on Mars. The podcast also explores movies about space, Mars exploration, dust accumulation on solar panels, and updates on various space missions. Additionally, they talk about appreciating astronomers and planetary scientists, provide a night sky tour, and discuss a tribute to astronaut Jerry Ross.

Jun 16, 2021 • 1h 5min
Amateur Astronomers Saving the World
The Planetary Society has awarded more than 60 Shoemaker near-Earth object grants to astronomers around the world, enabling them to discover, track, and characterize thousands of asteroids. We’ll hear from two of these dedicated observers. The Society’s Rae Paoletta takes us to Venus where three new spacecraft will help answer big questions. Senior space policy adviser Casey Dreier helps us think about UFO claims. Chief scientist Bruce Betts offers a new What’s Up space trivia contest. Discover more at https://www.planetary.org/planetary-radio/shoemaker-neo-awardees-venus missionsSee omnystudio.com/listener for privacy information.

Jun 9, 2021 • 1h 35min
Experimental Cosmologist Brian Keating
How did the universe begin? Why do galaxies look the way the do? Can we see the vanishingly dim light of undiscovered worlds in the Kuiper Belt? These are some of the questions that drive Simons Observatory director Brian Keating. He also thinks deeply about the existential challenges faced by young scientists and how the Nobel Prize for Physics should be reformed. We’ll spend a fascinating hour with Brian after we visit his lab with fellow physicists James Benford and Paul Davies. Planetary Society chief scientist Bruce Betts joins us for an up-front What’s Up segment. Discover more at https://www.planetary.org/planetary-radio/brian-keating-simons-observatory-cosmology-nobelSee omnystudio.com/listener for privacy information.

Jun 4, 2021 • 51min
Space Policy Edition: NASA's 2022 Budget Request Says "Yes"
President Joe Biden's new budget proposal for NASA is very good, supporting nearly every major Planetary Society priority. It would fund science at record levels, maintain Artemis' 2024 lunar landing date, and make major investments in technology and education. Casey and Mat break down the details and discuss what's next for NASA as Congress takes up this request. They also explore the decision to fund two missions to Venus. Discover more here: https://www.planetary.org/planetary-radio/0604-2021-spe-venus-missions-biden-budget-requestSee omnystudio.com/listener for privacy information.

Jun 2, 2021 • 1h 2min
Mighty Jupiter Revealed
Scott Bolton leads the Juno mission that has been orbiting and revealing Jupiter for five years. NASA has granted an extension that will keep the spacecraft exploring till 2025. Scott shares some of the most exciting recent science, and closes with the surprising tale of his first encounter with planetary scientist and Planetary Society founder Carl Sagan. Planetary Society Chief Scientist Bruce Betts continues our Jovial theme and prepares us for an annular solar eclipse. Discover more at https://www.planetary.org/planetary-radio/scott-bolton-juno-updateSee omnystudio.com/listener for privacy information.

May 26, 2021 • 55min
The New Great Space Observatories
The National Academies of Sciences, Engineering and Medicine will soon issue the Astro2020 Astronomy and Astrophysics Decadal Survey. It will rank four major proposals for exciting, expensive new space-based telescopes. Astrophysicist Grant Tremblay joins us to explain why all four competing instruments have been grouped as The New Great Observatories, hoping to repeat the marvelous success of a quartet of previous telescopes: Hubble, Spitzer, Chandra and Compton. Then we’ll join Bruce Betts on board the International Space Station for a space trivia contest about one of its commanders. Discover more at https://www.planetary.org/planetary-radio/grant-tremblay-new-great-observatoriesSee omnystudio.com/listener for privacy information.See omnystudio.com/listener for privacy information.

May 19, 2021 • 54min
Ingenuity Mars Helicopter Project Manager MiMi Aung
The tiny Mars Helicopter Ingenuity has flown into our hearts. Project manager MiMi Aung and her team may have made it look easy, but Aung explains why it was anything but. Bruce Betts has tips for viewing the upcoming total lunar eclipse. Planetary Radio t-shirts are back as prizes in the space trivia contest! And we’ve got space headlines from The Downlink, our weekly newsletter. Discover more at https://www.planetary.org/planetary-radio/mimi-aung-ingenuity-updateSee omnystudio.com/listener for privacy information.See omnystudio.com/listener for privacy information.

May 12, 2021 • 1h 14min
Defenders of Earth on Planetary Radio
The 2021 Planetary Defense Conference brought together the leading scientists, policymakers and other experts who are working to protect our planet from near-Earth objects (NEOs). The Planetary Society welcomed six of these heroes to a special virtual gathering in late April. You’ll hear their progress reports on this week’s show. One is our own Bruce Betts! He’ll stick around for a NEO-packed edition of What’s Up. Discover more at https://www.planetary.org/planetary-radio/2021-pdc-public-eventSee omnystudio.com/listener for privacy information.See omnystudio.com/listener for privacy information.

May 7, 2021 • 54min
Space Policy Edition: How Starship at the Moon Brings NASA Closer to Mars
In a surprise move, NASA chose SpaceX's Starship as the sole winner of its 3 billion-dollar human lunar lander development contract. Within days, Blue Origin and Dynetics filed official protests, forcing NASA to delay the award. Casey and Mat discuss how this selection, if it stands, is a smart move for a space agency that is serious about a true "Moon-to-Mars" program. Should we stop thinking about SpaceX as a scrappy startup and instead treat it as the world's leading aerospace company? Discover more here: https://www.planetary.org/planetary-radio/0507-2021-spe-bill-nelson-spacex-lunar-landerSee omnystudio.com/listener for privacy information.See omnystudio.com/listener for privacy information.