Dark Pit on Mars' Arsia Mons, with Sunlit Wall

The High Resolution Imaging Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter has confirmed that a dark pit seen on Mars in an earlier HiRISE image really is a vertical shaft that cuts through lava flow on the flank of the Arsia Mons volcano.

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<p><a href="http://www.physorg.com/news107789000.html">Dark Pit on Mars' Arsia Mons, with Sunlit Wall</a></p> <p>The High Resolution Imaging Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter has confirmed that a dark pit seen on Mars in an earlier HiRISE image really is a vertical shaft that cuts through lava flow on the flank of the Arsia Mons volcano.</p>