This photo, taken by the Curiosity rover's ChemCam instrument on Oct. 8, 2012, shows a close-up view of the piece (visible slightly below and to the left of the photo's center) that apparently fell ... more 
This photo, taken by the Curiosity rover's ChemCam instrument on Oct. 8, 2012, shows a close-up view of the piece (visible slightly below and to the left of the photo's center) that apparently fell off the robot. less 
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SPACE.com | Photo By NASA/JPL-Caltech
Tue, Oct 9, 2012 4:24 PM EDT