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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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.

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?