Mars Lander Moves Rock to Study What's Beneath

Rock moved by Mars lander The robotic arm on NASA's Phoenix Mars Lander slid a rock out of the way during the mission's 117th Martian day (Sept. 22, 2008) to gain access to soil that had been underneath the rock. Image credit: NASA/JPL-Caltech/University of Arizona/Texas A&M University
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September 23, 2008