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.

The Next Frontier

Carey Mae Parker has been missing from northeast Texas since 1991. People go missing every day, but there's something unusual about Carey's case. After two decades without answers, family members made a shocking discovery: Police never launched an investigation. We spent a year searching for clues about Carey's disappearance. And about the people who let it happen.

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The Next Frontier

The Next Frontier

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