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All indications are that three and a half billion years ago, Mars looked like Earth. It had lakes. It had rivers. It had river deltas. It had snow-capped peaks and puffy clouds and blue sky. Three and a half billion years ago, it was a happening place. The same time on Earth, that's when life started. So did life start on Mars?

John M. Grunsfeld

Biography

Author Profession: Astronaut
Nationality: American
Born: October 10, 1958

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