This set of NASA handout images compares the Link outcrop of rocks on Mars (L) with similar rocks seen on Earth (R). The image of Link taken September 2, 2012 and released September 27, 2012, was obtained by NASA's Curiosity rover and shows rounded gravel fragments, or clasts, up to a couple inches (few centimeters), within the rock outcrop. REUTERS/NASA/JPL-Caltech/MSSS and PSI/Handout
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