Planetary Radio Episodes

Since 2002, Planetary Radio has visited with a scientist, engineer, project manager, advocate, or writer who provides a unique perspective on the quest for knowledge about our Solar System and beyond. The full show archive is available for free.

Planetary Society All-Stars Review 2020 Space Milestones

In spite of everything, 2020 was a good year for space exploration according to five of The Planetary Society’s experts.

Astronaut Stephanie Wilson Might Walk on the Moon

18 astronauts on the Artemis Team have a shot at walking on the Moon, and Stephanie Wilson is one of them.

More Moon Water and an Update from Venus on Our 18th Anniversary!

Astronomer Jane Greaves returns with an update on the phosphine gas floating above Venus, before Casey Honnibal takes us through her team’s discovery of water right out under the Sun on Earth’s Moon.

A Deep Dive into Asteroid Bennu With Dante Lauretta

The leader of the OSIRIS REx asteroid sample return mission shares more details of last week’s encounter in an exclusive interview, while we also learn about the proposed mission to look for life on Saturn’s moon Enceladus.

Protectors of Earth! (and Other Worlds)

NASA’s planetary protection officer joined Mat Kaplan’s Humans to Mars summit panel for a great conversation about protecting worlds throughout the solar system from what could be devastating contamination.

Have We Found Evidence of Life on Venus?

It could be a profound and historic discovery made on Earth’s nearest planetary neighbor.

Space Policy Edition: The Moon-to-Mars Strategy, with Dr. Scott Pace

The National Space Council’s Scott Pace talks with Casey Dreier about the current administration’s sweeping new strategy that integrates all elements of space development and exploration.

The Sirens of Mars Call to Us

Georgetown University planetary scientist Sarah Stewart Johnson chronicles the long history of our fascination with Mars and the possibility of life there, culminating with Perseverance, the new rover now headed there.

Why Aren't There More Earth-Like Planets in our Solar System?

New research reveals why Earth is on its own in this solar system’s habitable zone where liquid surface water flows, but the same isn’t true across the galaxy.

Space Policy Edition: Why the SLS is a National Asset, and Why That Matters

The Coalition for Deep Space Exploration’s Mary Lynne Dittmar talks with Casey Dreier about how and why spacefaring nations prioritize funding for space development and exploration.

China on the Final Frontier

China has big plans for a space station, exploration of the Moon and Mars, and possibly a mission that will follow Voyager beyond the edge of the solar system.

Staying Alive in Space

Are we learning how to keep men and women alive on a 3-year round trip to Mars?

Crew Dragon Thrills While Mars Chills

After a special message we present highlights of the successful arrival at the International Space Station of the Crew Dragon spacecraft, followed by a visit to chilly Mars with planetary scientist Edgard Rivera-Valentin.

Celebrating 30 Years of Hubble with Astronaut John Grunsfeld

Astrophysicist and former astronaut John “Hubble Repairman” Grunsfeld looks back over three decades of beautiful science and inspiration delivered by the Hubble Space Telescope.

Looking for Life in Alien Oceans

JPL scientist Kevin Hand is endlessly fascinated by the possibility of life in the hidden oceans of the outer solar system’s moons, and now he has written a great book about the quest to discover it.

Space Policy Edition: Our Moral Obligation to Explore Space

Philosopher James Schwartz shares his thoughts about the ethics of space exploration, commercialization, and settlement.

Life on Mars: Joining the Quest with Penny Boston and Jim Green

The search for life on Mars is at a critical stage. What will come next if we find it?

Life=Matter+Information: Paul Davies and the Demon in the Machine

Physicist and author Paul Davies returns to talk about his new book that explores the defining role information plays in life on Earth and perhaps elsewhere.

Space Policy Edition: Is the Moon a Stepping-Stone or a Cornerstone for Mars? (with Laura Seward Forczyk)

Casey and his guest discuss a bill working its way through the US House of Representatives that challenges the Artemis plan adopted by NASA for human exploration of the Moon and Mars.

Meet the Planetary Society’s Newest Asteroid Hunters

We talk with two of our 2019 Shoemaker NEO Grant winners, who received funding to help find, track, and characterize potentially hazardous asteroids.

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