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Why we need to go back to Mars

By Joel Levine from TED in ASTROBIOLOGY , ASTRONOMY , PHYSICS

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In this talk, planetary scientist Joel Levine shows some intriguing -- and puzzling -- new discoveries about Mars: craters full of ice, traces of ancient oceans, and compelling hints at the presence, sometime in the past, of life. He makes the case for going back to Mars to find out more.

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