This shaded relief image shows the moon's Shackleton Crater, a 21-km-wide crater permanently shadowed crater near the lunar south pole. The crater’s interior structure is shown in false color based ... more 
This shaded relief image shows the moon's Shackleton Crater, a 21-km-wide crater permanently shadowed crater near the lunar south pole. The crater’s interior structure is shown in false color based on data from NASA's LRO probe. Image released less 
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SPACE.com | Photo By NASA/GSFC/SVS
Wed, Jun 20, 2012 1:12 PM EDT