Planetary Radio: Space Exploration, Astronomy and Science

Hosted by The Planetary Society

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Episodes

1356

Latest episode

Aug 2026

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EN-US

About the show

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.

Listen to episodes

60 recent

September 30, 20261 hr 1 min

2026 NASA's Innovative Advanced Concepts Symposium: Part 1 — Nuclear sensors and cave explorers

Some of the most exciting science in our Solar System is hidden in places we've never been able to reach. In this episode, Sarah Al-Ahmed shares three conversations from the 2026 NASA Innovative Advanced Concepts (NIAC)Symposium at Wichita State University, all about the bold, early-stage concepts being developed to explore them. First, Peter Cabauy, CEO and co-founder of City Labs Incorporated, and Mason Peck, former NASA Chief Technologist and collaborator on the project, discuss their Phase II concept, Autonomous Tritium Micropowered Sensors, tiny nuclear-powered probes designed to survive and operate in the permanently shadowed craters of the Moon and beyond. Then, Daniel Drew, assistant professor of electrical and computer engineering at the University of Hawaiʻi at Mānoa, introduces SPARK, a Phase I concept for silent, solid-state flying robots that could explore caves on Saturn's moon Titan. Finally, Gilly Elor, physics lead at Stone Aerospace, and Bill Stone, founder of Stone Aerospace, walk us through LUX, the Lunar Underground Explorer, a Phase I concept for a laser-powered, fiber-tethered drone that could be the first mission to enter a cave on another world. Plus, Bruce Betts, chief scientist of The Planetary Society, joins Sarah for What's Up, where they preview Saturn at opposition and the start of World Space Week on October 4th. Discover more at: https://www.planetary.org/planetary-radio/2026-niac-symposium-part-1 See omnystudio.com/listener for privacy information.

September 23, 20261 hr 0 min

Hayabusa2 flies by asteroid Torifune

JAXA's Hayabusa2 flew within 400 meters (1,300 feet) of asteroid Torifune on July 5 and confirmed that it's a contact binary, two lobes stuck together. Paul Abell, NASA's Chief Scientist for Small Body Exploration at Johnson Space Center, walks us through the findings on the asteroid, what they mean for planetary defense, and what's ahead as the spacecraft cruises toward its next target. Then Bruce Betts, chief scientist at The Planetary Society, digs into Hayabusa2's history of firing things at asteroids. Discover more at: https://www.planetary.org/planetary-radio/2026-hayabusa2-torifune See omnystudio.com/listener for privacy information.

September 18, 20261 hr 7 min

Book Club Edition: Alien Oceans by Kevin Hand

Where are we most likely to find evidence of life, past or living, in the Solar System? Planetary scientist and author Kevin Hand looks to warm, salty ocean depths beneath protective layers of ice on worlds such as Europa and Enceladus. His enthralling book became a popular selection in The Planetary Society’s member book club. He recently joined the Society’s Mat Kaplan for a deep exploration of the best science. Kevin also shared tales of his own harrowing, revealing journeys through Earth’s undersea world. Discover more at: https://www.planetary.org/planetary-radio/book-club-kevin-hand See omnystudio.com/listener for privacy information.

September 16, 20261 hr 7 min

Star Trek at 60: What Vulcans and Klingons can teach us about being human (Part 2)

This is part two of our Star Trek 60th anniversary series. Robert Picardo, the Emergency Medical Hologram on Star Trek: Voyager and a member of The Planetary Society's board of directors, reads a vintage letter from Star Trek creator Gene Roddenberry asking fans to join a brand new organization called The Planetary Society. Tim Russ, who played Tuvok on Star Trek: Voyager, Deep Space Nine, Lower Decks, and Picard, joins us to talk about what the Vulcans can teach us about the discipline we'll need to survive in deep space, and shares his own experience as an amateur astronomer who contributed data to NASA's Lucy mission. Karim Diané, Jay-Den Kraag on Star Trek: Starfleet Academy, talks about playing a Klingon who defies everyone's expectations of what it means to be strong. And Bruce Betts, chief scientist of The Planetary Society, is here with What's Up, discussing Star Trek technologies. Discover more at: https://www.planetary.org/planetary-radio/2026-star-trek-at-60-part-2 See omnystudio.com/listener for privacy information.

September 9, 202659 min

Star Trek at 60: What do we value the most? (Part 1)

Star Trek turned 60 on Sept. 8, 2026, and to celebrate, we're kicking off a special two-part series exploring the franchise's deep and lasting connection to real-world space exploration. In Part 1, Robert Picardo, the Emergency Medical Hologram from Star Trek: Voyager, now starring in Star Trek: Starfleet Academy and a member of The Planetary Society's Board of Directors, joins Sarah Al-Ahmed to trace the relationship between Star Trek and The Planetary Society all the way back to a 1980 letter from Gene Roddenberry himself. Bob talks about how playing a holographic doctor for 30 years led him to become a real-world space advocate, and what Star Trek's non-human characters can teach us about what it means to be human. Then, Bruce Betts, Planetary Society Chief Scientist, joins for What's Up and a discussion of solar sails in the franchise. Discover more at: https://www.planetary.org/planetary-radio/2026-star-trek-at-60-part-1 See omnystudio.com/listener for privacy information.

September 4, 20261 hr 7 min

Space Policy Edition: The Long Space Age with Alex MacDonald

We tend to think of private space exploration as a recent phenomenon. But as Alex MacDonald, former Chief Economist at NASA, argues in his book "The Long Space Age," privately funded space exploration has deep roots in American history, stretching back more than two centuries. In this 2017 conversation with The Planetary Society's Chief of Space Policy Casey Dreier, originally aired on the Space Policy Edition of Planetary Radio, MacDonald traces the economic history of American space exploration from the 1769 transit of Venus all the way to the present day, and makes the case that the government-dominated model we grew up with may actually be the historical anomaly. Discover more at: https://www.planetary.org/planetary-radio/long-space-age See omnystudio.com/listener for privacy information.

September 2, 20261 hr 4 min

World Space Week and farewell to Swift

Dennis Stone, president and co-founder of the World Space Week Association, takes us behind the scenes of the largest annual space event on Earth. From its origins as a volunteer effort in Houston to a UN-declared celebration reaching 50,000 events in over 100 countries, Dennis shares how World Space Week inspires the next generation, and how you can get involved this Oct. 4 through 10. Then, Science Editor Asa Stahl breaks down the end of the Neil Gehrels Swift Observatory, the 21-year-old space telescope that's falling out of orbit after a bold rescue mission fell short. Plus, Chief Scientist Bruce Betts looks back at a milestone centennial in this week's What's Up, 100 years since Robert Goddard launched the world's first liquid-fueled rocket. Discover more at: https://www.planetary.org/planetary-radio/2026-world-space-week-and-swift See omnystudio.com/listener for privacy information.

August 26, 202656 min

The Nancy Grace Roman Space Telescope is ready to launch

After decades of development, the Nancy Grace Roman Space Telescope is preparing to launch. Once in orbit, Roman will conduct the widest surveys of the universe ever attempted, probing the nature of dark energy, discovering thousands of new exoplanets, and capturing images of billions of galaxies. In this episode, we sit down with Julie McEnery, senior project scientist for Roman at NASA's Goddard Space Flight Center, and Jason Rhodes, project scientist for Roman at NASA’s Jet Propulsion Laboratory, to explore what the telescope will reveal and how scientists around the world will be able to access and work with its data. Plus, in What's Up, we look at Roman's coronagraph and what it will take for the Habitable Worlds Observatory to push that technology far enough to image Earth-like worlds around Sun-like stars. Discover more at: https://www.planetary.org/planetary-radio/2026-nancy-grace-roman See omnystudio.com/listener for privacy information.

August 21, 20261 hr 17 min

Book Club Edition: Becoming Martian by Scott Solomon

Will we change or terraform Mars to better suit humans? Or are we more likely to change ourselves to better fit the red planet? How far can evolution take us in these new and exotic environments? These and many other fascinating questions are at the heart of Rice University professor Scott Solomon’s great book, “Becoming Martian”. He joins host Mat Kaplan for a far-ranging conversation in this month’s installment of Planetary Radio’s book club edition. Discover more at: https://www.planetary.org/planetary-radio/book-club-scott-solomon See omnystudio.com/listener for privacy information.

August 19, 20261 hr 3 min

The SpaceX Falcon 9 that crashed into the Moon

A SpaceX Falcon 9 upper stage slammed into the moon on August 5 after spending over a year and a half drifting through the Earth-Moon system. Jared Head, museum facilitator at Columbia Memorial Space Center, producer at TMRO, and co-host of All Space Considered at Griffith Observatory, walks us through how a rocket launched in January 2025 ended up crashing into the lunar surface. Kate Howells, the Planetary Society's public education specialist, shares her experience witnessing Europe's first total solar eclipse in 27 years from a canyon in Spain on her honeymoon. Plus, Jack Kiraly, the Planetary Society's chief of advocacy, gives us an update on the campaign to save NASA science and the proposed changes to OMB's federal grant-making rules. We close with Bruce Betts, our chief scientist, who joins for What's Up, to discuss Point Nemo, the spacecraft graveyard in the South Pacific. Discover more at: https://www.planetary.org/planetary-radio/2026-falcon-9-moon-crash See omnystudio.com/listener for privacy information.