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Martian Robot
Featured on December 29, 2010
The Opportunity rover casts its shadow on the edge of Santa Maria, a 250-foot-wide crater on Mars. Opportunity arrived at the crater in mid-December and is expected to remain there for several weeks. The shadow at top is cast by Opportunity's cameras, which are mounted atop a tall mast. The small device at bottom is an X-ray detector. [NASA/JPL]
