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Planetary Radio: Space Exploration, Astronomy and Science

The Planetary Society

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

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All Episodes

59:31

Day of Action 2026: Rejoining the fight to save NASA...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/05/06

Every year, members of The Planetary Society travel to Washington, D.C., to make their voices heard on Capitol Hill. This year, just days after the Artemis II crew splashed down off the coast of San Diego, the Presidential Budget Request dropped once more, proposing a 46% cut to NASA's science budget. Planetary Radio host Sarah Al-Ahmed was on the ground capturing the passion, the preparation, and the people behind one of the largest Days of Action in the Planetary Society's history. In this

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78:39

Space Policy Edition: Why humans matter — The...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/05/01

When Artemis II returned its crew safely to Earth, millions of people found themselves unexpectedly moved. The mission was a test flight, a proof-of-concept, and yet it felt like something far greater than the sum of its parts. In this episode, 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 the deeper meaning of humanity's return to deep space. Drawing on philosophy of

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59:40

Yuri's Night 2026: Celebrating 65 years of human...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/04/29

On April 12th, 1961, Yuri Gagarin became the first human in space. Sixty-five years later, we celebrated that milestone at Griffith Observatory in Los Angeles, CA. We began on the lawn of Griffith Observatory, where host Sarah Al-Ahmed spoke with exhibitors about the tools, dreams, and technology that drive space exploration. Laura Tomlin, CEO of Space for Teachers, shares how microgravity research projects inspire the next generation. Robotics engineer Kalind Carpenter from NASA’s Jet

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61:58

Project Hail Mary hits the big screen

Planetary Radio: Space Exploration, Astronomy and... ·

2026/04/22

“Project Hail Mary” is finally in theaters, and the science is just as thrilling as the story. This week on Planetary Radio, Sarah Al-Ahmed and senior communications adviser Mat Kaplan share their first reactions fresh from the theater. Author and producer Andy Weir tells us in his own words what the story is really about, in a flashback conversation with Mat. Award-winning Nature correspondent Alexandra Witze takes a critical scientific eye to the film. Virginia Tech astrophysicist

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57:50

Book Club Edition: Founder and CEO Peter Beck on The...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/04/17

He built a rocket-powered bike when he was a kid. Now he leads the company that has made New Zealand number three among nations that launch big rockets, following the United States and China. Sir Peter Beck joins us for a deeply revealing and entertaining conversation about “The Launch of Rocket Lab,” the beautiful book that tells his and Rocket Lab's inspiring story. His dedication to advancing planetary science missions will make members of The Planetary Society proud! Discover more

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59:56

Triumph and turmoil: Artemis II and the renewed fight...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/04/15

The Artemis II crew has returned home safely after a historic 10-day journey around the Moon, the first crewed lunar mission in over 50 years. In this episode, we celebrate some of the mission's most extraordinary moments: the record-breaking Flight Day 6 when Commander Reid Wiseman, Pilot Victor Glover, and Mission Specialists Christina Koch and Jeremy Hansen traveled farther from Earth than any humans in history, a breathtaking solar eclipse observed from lunar orbit, meteorite impact flashes

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57:36

Artemis II launches to the Moon

Planetary Radio: Space Exploration, Astronomy and... ·

2026/04/08

Four astronauts — Commander Reid Wiseman, Pilot Victor Glover, Mission Specialists Christina Koch and Jeremy Hansen — are on their way around the Moon, on a journey that will take them farther from Earth than any human has gone before. This week on Planetary Radio, we bring you the sounds of launch day and the voices of the people who lived it. You’ll hear from the engineers who built the spacecraft, including Mark Tobias, chief engineer at Northrop Grumman, Jan-Henrik Horstmann,

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73:24

Space Policy Edition: Return to Launch — Cape...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/04/03

What makes Cape Canaveral the center of U.S. spaceflight? The answer is a fascinating mix of geography, military strategy, Cold War politics, and a fair amount of historical accident. In this episode of the Space Policy Edition of Planetary Radio, host Casey Dreier, chief of space policy at The Planetary Society, sits down with Stephen C. Smith, author and writer behind the Substack The Space Pundit, to discuss his book Return to Launch: Florida and America's Space Industry. A longtime Kennedy Space

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60:38

Artemis II’s AVATAR and a sungrazing comet

Planetary Radio: Space Exploration, Astronomy and... ·

2026/04/01

Artemis II is the first crewed lunar mission since Apollo 17, and riding alongside the crew is one of the most ambitious biology experiments ever sent to space. It's called AVATAR, short for A Virtual Astronaut Tissue Analog Response: tiny organ chips grown from the astronauts' own cells, flying the same trajectory around the Moon, exposed to the same deep-space radiation and microgravity as the crew themselves. Lisa Carnell, director of NASA's Biological and Physical Sciences Division, explains

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63:23

The astronaut health experiments of Artemis II

Planetary Radio: Space Exploration, Astronomy and... ·

2026/03/25

Artemis II is about more than getting four humans to the Moon and back. It's an opportunity to gather data on human health in deep space that we haven’t had in over 50 years. This week, we’re joined by Steve Platts, chief scientist of NASA's Human Research Program, who walks us through the suite of human health experiments flying aboard Artemis II, from the ARCHER wearable sensors tracking crew health and team dynamics, to dry saliva swabs measuring stress hormones. Then Casey Dreier,

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77:34

Book Club Edition: The Giant Leap: Why Space is the...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/03/20

Join us for an awe-inspiring conversation with astrobiologist and astronomer Caleb Scharf as he eloquently makes the case for "dispersal," the nearly inevitable advance of life and humanity across our solar neighborhood. From the book: "The idea of Dispersal is one where the sheer scale and scope of life’s future extension into the solar system profoundly changes things: not because of some new (and unlikely) cultural enlightenment from within but because of what the enormous expanse of space

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56:45

The 18th European Space Conference: Dreaming of...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/03/18

Humanity is going back to the Moon, and Europe is already playing a critical role in making it happen. This week, Planetary Radio brings you voices straight from the 18th European Space Conference in Brussels, Belgium, where more than 2,000 of the world’s top space leaders gathered to shape the future of European space exploration. We begin with conference co-organizer Tomas Dimitrov of Logos and Business Bridge Europe, who sets the stage for the conversations ahead. From there, we hear from

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61:41

Starman: Looking back on a life exploring the Solar...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/03/11

Gentry Lee spent nearly five decades at NASA's Jet Propulsion Laboratory, and in that time he helped shape some of the most ambitious missions in the history of space exploration. A new documentary, “Starman,” chronicles his career and the big question that runs through it: is there life beyond Earth? Lee worked on every NASA mission to land on Mars, helped Carl Sagan bring the Universe to living rooms around the world with “Cosmos,” and oversaw dozens of active missions as

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68:43

Space Policy Edition: Is there really a space race...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/03/06

Is the United States really in a new space race with China? Or is that framing missing the bigger picture? In this Space Policy Edition of Planetary Radio, Casey Dreier, chief of space policy at The Planetary Society, sits down with Patrick Besha, former NASA strategic advisor on China, to explore the realities behind China’s rapidly advancing space program. They discuss how China’s political system shapes its long-term space strategy, why the rhetoric about a “space race”

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58:15

Artemis update: NASA reshapes the road back to the Moon

Planetary Radio: Space Exploration, Astronomy and... ·

2026/03/04

NASA has announced a major restructuring of the Artemis program, reshaping the roadmap for returning humans to the Moon. At a February 27 press conference, agency leadership addressed the rollback of Artemis II following post–wet–dress–rehearsal testing and unveiled significant changes to upcoming missions, including shifting Artemis III from a planned lunar landing to a low-Earth-orbit rendezvous and integrated systems test. In this episode, you’ll hear remarks from NASA

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59:57

Did an impact trigger cryovolcanism on Umbriel?

Planetary Radio: Space Exploration, Astronomy and... ·

2026/02/25

Could a single ancient impact have briefly transformed one of the Solar System’s darkest moons into a cryovolcanic world? When Voyager 2 flew past Uranus in 1986, it captured the only close-up images we have of Umbriel, a heavily cratered, charcoal-dark satellite long considered geologically inactive. But one feature stands out: a bright ring inside the 131-kilometer-wide Wunda crater. In this episode, Sarah Al-Ahmed speaks with Adeene Denton, NASA postdoctoral program fellow at the Southwest

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56:54

Book Club Edition: Planetary Society Chief Scientist...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/02/20

They informed and entertained together throughout the first 20 years of Planetary Radio. Listen in as the Society’s chief scientist and book club edition host Mat Kaplan share the mic once again for a delightful conversation about Dr. Betts’ two new space books for young people. “Are We Alone?” introduces the search for life across the Universe, while “The Size of Space” collects many of Bruce’s brilliant and hilarious ways to cut our Solar System down to

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59:59

A new chapter at The Planetary Society: Jennifer...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/02/18

This week on Planetary Radio, we mark a major leadership transition at The Planetary Society. Host Sarah Al-Ahmed sits down with Bill Nye, outgoing chief executive officer and newly appointed chief ambassador of The Planetary Society, and Jennifer Vaughn, incoming chief executive officer and former chief operating officer, for a candid conversation about this long-planned transition. Together, Bill and Jenn reflect on how the organization, under their shared leadership, grew into the world’s

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62:01

Where did Earth’s water come from? Clues hidden in...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/02/11

Where did Earth’s water come from? In this episode of Planetary Radio, we explore how scientists are answering that question by studying a remarkably well-preserved record of the early Solar System: lunar samples brought back by the Apollo missions. Host Sarah Al-Ahmed is joined by Tony Gargano, postdoctoral fellow at the Lunar and Planetary Institute with the University Space Research Association and a research affiliate at NASA’s Johnson Space Center. Gargano studies lunar rocks and

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60:35

Space Policy Edition: What a NASA Authorization bill...

Planetary Radio: Space Exploration, Astronomy and... ·

2026/02/06

What does a NASA authorization bill actually do, and why does it matter? In this episode of Space Policy Edition, we dig into one of the most misunderstood but powerful tools Congress uses to shape the future of U.S. space exploration. Host Casey Dreier, chief of space policy at The Planetary Society, is joined by Jack Kiraly, the Society’s director of government relations, for a deep dive into how NASA authorization bills work, how they differ from appropriations, and why they can have

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1,353 results

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