Sunday, October 31, 2010

Mysterious Mars gullies likely carved by CO2
[ Sat, 30 Oct 2010 22:35:40 GMT ]

These gullies on a Martian sand dune resemble features on Earth that are carved by water. However, they were likely formed by processes related to the winter buildup of carbon-dioxide frost, according to a new study. The top photo was taken in March 2008 (Martian autumn), the middle one in July 2009 (summer) and the bottom photo in October 2010 (winter). All were taken by NASA's Mars Reconnaissance Orbiter.Some of the mysterious gullies on Mars are likely carved by frozen carbon dioxide, not melting water, a new study finds.


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