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Last updated on April 19, 2014 at 13:20 EDT
Ascraeus Mons
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Ascraeus Mons

May 4, 2011
This VIS image shows part of the eastern flank of Ascraeus Mons, one of the large Tharsis Volcanoes. The circular pits all aligned in a row mark the collapse of the roof of a lava tube.