Photo: Snowmelt Carved Mars Gullies Later Than Thought

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A "beheaded" glacier in Antarctica's Dry Valleys, seen in an undated photo, resembles gullies in Martian crater walls.

Deep hollows (such as these, top and far left) can catch Martian snow, which melts and carves out gullies, says a study released in August 2008.

Photograph courtesy David R. Marchant/Boston University

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