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Saturday, May 17, 2008 |
Saturday, May 17, 2008 |
Photo: Melting Snow Created Mars Gullies, Expert SaysA new study suggests that gullies elsewhere on the red planet were formed when recurring climate changes caused snow to fall and then melt in the relatively recent past. Image courtesy NASA/JPL/University of Arizona
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ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAY |
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