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Made for Mars

Big Picture Science

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The Viking Landers' Return to Mars

CNN's John Defterios was born in 1976, the same year that the Vikings landed on Mars. He says there were rocks everywhere and some hills, but not much evidence of life. The planet is a dusty desert world with reddish tints due to iron oxidized over many years. But it remains interesting today because it tells us something about another path our planet could potentially have taken, he says.

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