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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Perseverance Perseveres: A Mars rover update from Ken Farley

The Mars 2020 rover has rolled into an ancient river delta on the Red Planet. Will we find evidence of past life there?

Water, water everywhere with Bethany Ehlmann

Water may have flowed on Mars for a billion more years than was previously thought, giving possible life an extra billion years to thrive.

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.

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?