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Home 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) 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)

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)

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)

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)

his infographic highlights NASA’s twin robot geologists, the Mars Exploration Rovers (MER) Spirit and Opportunity. (NASA/JPL-Caltech)
From its perch high on a ridge, NASA’s Mars Exploration Rover Opportunity recorded this image of a Martian dust devil twisting through the valley below. (NASA/JPL-Caltech)