11-07-2009, 01:13 AM
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#10
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Avalon Senior Member
Join Date: Sep 2008
Location: So. Cal. U.S.
Posts: 4,205
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Re: Apod
This feature on Mars is a candidate cavern entrance. It is northeast of Arsia Mons – one of the four giant Tharsis volcanoes on the red planet. Credit: NASA/JPL/University of Arizona
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