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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)

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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