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Hi. I'm Jim Green NASA's chief scientist
and your host on NASA's podcast gravity assist.

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You know, life on earth is just
about everywhere we look - from the depths

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of the ocean to even the Antarctic
Tundra. Here on Earth we find that

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against all odds, life survives and
thrives but what do we know about life

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beyond Earth? Are we alone?

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Life on Earth just occupies a teeny portion of all of time.

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To me, life seems so inevitable and the universe is so

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broad and vast that I can't imagine that
we would be alone in all of that space.

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If we're the only game in town,
it's an awful waste of space.

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We do not know if there is life beyond the Earth. You just have to search and search.

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If you've ever wondered if there's life out
there beyond our planet, you won't want

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to miss this season's Gravity Assist. In
each episode, I'll be talking with

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scientists that specialize in the field
of astrobiology. I'll be asking them, "How

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do we define life?  What is life anyway?
What do we know about how life got

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started here on Earth and how it
developed in this beautiful complexity that we

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see today? What could life be like beyond Earth and how do we look for it?"

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So there are a lot of wild and crazy places that we could search for life.

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The moons of Saturn and
Jupiter are so compelling-

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Ganymede,Titan, Europa, Enceladus.

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Life might have existed on Mars in its past and might even exist there today.

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On exoplanets,
because there's a lot. On average, there's

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an exoplanet for every star in the sky
and for every 10 stars there's one that

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might have liquid water oceans.

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Advancing the technologies for one helps us look for it in any place that we might be looking.

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Here at NASA, we have a fleet of

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spacecraft going out into the solar
system and beyond

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and a lot of fabulous scientists that
are piecing together this puzzle from

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the observations these missions make.

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Join me on this journey to find out what's out there.