Cavernous findings from Mars

12:10pm, April 10, 2007

Images taken by a Mars-orbiting spacecraft show what appear to be cave entrances on the Red Planet. By sheltering organisms from such hazards as ultraviolet radiation and micrometeoroid bombardment, caves "could be among the only places on Mars to find evidence of past or present microbial life," says Glen Cushing of the U.S. Geological Survey in Flagstaff, Ariz.

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