Discovery Channel :: News, Photo Zoom :: Cave Entrances Found on Mars
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Photo Zoom

Martian Caves
NASA/JPL-Caltech/ASU/USGS

Martian Caves
Seven very dark holes on the north slope of a Martian volcano have been proposed as possible cave skylights, based on day-night temperature patterns suggesting they are cave openings.

Pictures: NASA/JPL-Caltech/ASU/USGS

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