It’s a problem when you have so many worlds to explore at once. How long until we colonize Mars? Can we turn the Sahara Desert into a Garden of Eden oasis? How can humans live in a lava tube on the moon? Jim Green is the Chief Scientist at NASA and he's not only been pondering these questions, he's been working to make them happen. Jim likes to think big - about big ideas, big challenges, and bigger solutions! In this episode, Jim Green and Alan Alda talk about planetary exploration and how life itself survives and thrives in the strangest of places.

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