This split-view image shows an elevation map (left) and shaded relief (right) of the 21-kilometer-wide Shackleton Crater. The crater’s structure is shown in false color from data by NASA's LRO ... more 
This split-view image shows an elevation map (left) and shaded relief (right) of the 21-kilometer-wide Shackleton Crater. The crater’s structure is shown in false color from data by NASA's LRO probe. Image released June 20, 2012. less 
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SPACE.com | Photo By NASA/GSFC/SVS
Wed, Jun 20, 2012 1:12 PM EDT