v SpaceX's Elon Musk and Joseph Gordon-Levitt Talk Manned Mars Missions

SpaceX's Elon Musk and Joseph Gordon-Levitt Talk Manned Mars Missions

Billionaire rocket-maker Elon Musk of SpaceX shared his big vision for a "self-sustaining civilization" on Mars with actor Joseph Gordon-Levitt in a short documentary set to air this weekend.

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