This undated photo provided by the U.S. Geological Survey Astrogeology Science Center shows Apollo 15 astronauts Jim Irwin, left, and Dave Scott driving a prototype of a lunar rover in a volcanic cinder field east of Flagstaff, Ariz. The rover, named Grover, now is on display at the science center. (U.S. Geological Survey Astrogeology Science Center via AP)
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