Explore Worlds
Find Life
Defend Earth
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.
Principal Investigator Alan Stern returns for the first time since launch of New Horizons toward Jupiter, Pluto and beyond.
Has NASA's Vision for Space Exploration Become Nearsighted?
Closing In On An Interplanetary Mystery: The Pioneer Anomaly
The Orion Nebula As You've Never Seen It
Andrew Westphal on what's been found in the Stardust Sample Return Capsule and John Spencer on the New Horizons launch and the upcoming Jupiter flyby.
Stardust Samples Streak Safely Home
A Special Reprise: The Planetary Society's 25th Anniversary Gala
Countdown to Sample Return: A Stardust Special
Still Making a Deep Impact, with Jessica Sunshine
Uranus and Neptune Take Center Stage With Heidi Hammel
NASA Administrator Michael Griffin, and Your Ticket to Space
Lou Friedman on China's Rising Star in Space
One Martian year of Spirit and Opportunity on Mars with Jim Bell, Cornell University; Q and A on a crusty moon; special trivia contest prize.
New Horizons PI Alan Stern on the mission to Pluto, and discovery of 2 new moons. Q&A: movies from rocket launches. New trivia contest.
The Planetary Society celebrates 25 years with 300 close friends, including Ray Bradbury and Bill Nye. Also, a new What's Up space trivia contest.
Steve Wall, deputy leader of the Cassini RADAR team, on new images of Huygens' landing site and a shoreline. Asteroids on Q&A, new What's Up Contest.
Dava Sobel has just written The Planets. Not a drop of water on Jupiter's moon Io in Q and A, space headlines, and Mars comes close.
The beloved author, poet and visionary is back to talk about his inspirations, the romance of space exploration, and much more. Q&A on the biggest object in the Kuiper Belt, and a new space trivia contest on What's Up.
Venus Express Project Scientist Håkan Svedhem talks about the first mission to the mysterious planet in more than a decade. Q&A on Jupiter's Great Red Spot and other storms. What's Up announces TWO new space contests.
Swift satellite principal investigator Neil Gehrels on what causes the universe's biggest explosions. Q&A on the rings of Saturn, and a new space trivia contest during our What's Up segment about the night sky and more.