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The Next Frontier

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What would it take for humans to live beyond Earth?

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Colonizing Mars or more distant planets seems like science fiction. But becoming a spacefaring species may be in our near future. This hour, TED speakers on living beyond Earth--and whether we should. Guests include NASA Chief Scientist James Green, science writer Stephen Petranek, MIT Media Lab researcher Lisa Nip, and astronomer Lucianne Walkowicz.

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