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Home his infographic highlights NASA’s twin robot geologists, the Mars Exploration Rovers (MER) Spirit and Opportunity. (NASA/JPL-Caltech) his infographic highlights NASA's twin robot geologists, the Mars Exploration Rovers (MER) Spirit and Opportunity. (NASA/JPL-Caltech)

his infographic highlights NASA’s twin robot geologists, the Mars Exploration Rovers (MER) Spirit and Opportunity. (NASA/JPL-Caltech)

his infographic highlights NASA's twin robot geologists, the Mars Exploration Rovers (MER) Spirit and Opportunity. (NASA/JPL-Caltech)

his infographic highlights NASA’s twin robot geologists, the Mars Exploration Rovers (MER) Spirit and Opportunity. (NASA/JPL-Caltech)

The small spherules on the Martian surface in this close-up image are near Fram Crater, visited by NASA’s Mars Exploration Rover Opportunity during April 2004. (NASA/JPL-Caltech/Cornell/USGS)