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.

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Science from the Moon, and former NASA chief scientist Jim Green looks back

The former director of NASA’s Planetary Science division, Jim Green, retired as the agency’s chief scientist in January. This episode opens with a special announcement from host Mat Kaplan.

Cassini’s Dramatic End: A Planetary Radio Reprise

We were there when the Cassini spacecraft ended 13 years of exploration and revelation at Saturn.

Discovering life elsewhere: How can we be sure?

NASA’s Jim Green and Mary Voytek want the science community to develop tools that will help us evaluate potential evidence of life beyond Earth.

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?

New Horizons Flyby: Join the Celebration!

Join us at the Applied Physics Lab in Maryland for the New Horizons encounter with the most distant object ever visited. You’ll meet mission leaders, friends and even a rock and roll star as we dive deep into this triumph of exploration.

Long Live Cassini!

Join us at JPL and Caltech on the bittersweet morning the Cassini spacecraft plunged into Saturn.

Buzz Aldrin and Other Martians

He walked with Neil Armstrong on the moon, but that may not be his greatest legacy. Buzz Aldrin was joined by other space stars at the recent Humans To Mars Summit.