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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Planetary Radio 5th Anniversary Show: Astronomer Geoff Marcy on Discovery of Fifth Planet in Star System

We celebrate our 5th anniversary by learning about discovery of a five-planet star system, the largest found so far. Q&A on Jupiter's red spot.

Billions of Earths?

Billions of Earths?

Hunting for Extrasolar Planets

Hunting for Extrasolar Planets