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Wednesday, November 11, 2009 |
Wednesday, November 11, 2009 |
Photo: Mars Clay "Layer Cake" Adds to Proof of Watery PastThe ancient minerals add to evidence that early Mars was watery and could help scientists determine which areas, if any, were habitable. Image courtesy NASA/JPL/University of Arizona
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ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAY |
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