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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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.