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Sunday, September 7, 2008 |
Sunday, September 7, 2008 |
Photo: Mars Once Had Oceans, New Evidence SuggestsEvidence for the ocean that had previously been discounted because of strange surface features shouldn't be discounted, suggest scientists who have developed a new theory about Mars's shifting poles. Image courtesy Tyler Perron/Nature
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ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAY |
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