Photo: Melting Snow Created Mars Gullies, Expert Says

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A crater near the Martian north pole sports gullies lined with frost in an image taken by the Mars-orbiting HiRISE camera on January 20, 2008.

A 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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