Playlist

Are we alone in the universe?

Is Earth really the only life-sustaining planet? These speakers think there might just be something or someone else out there -- and urge us to keep looking for it.

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Jill Tarter

Join the SETI search

James Green

3 moons and a planet that could have alien life

Carolyn Porco

Could a Saturn moon harbor life?

Tabetha Boyajian

The most mysterious star in the universe

Penelope Boston

There might just be life on Mars

Freeman Dyson

Let's look for life in the outer solar system

Seth Shostak

ET is (probably) out there -- get ready

Jeremy Kasdin

The flower-shaped starshade that might help us detect Earth-like planets

Nathalie Cabrol

How Mars might hold the secret to the origin of life