This August 2011 image made available by NASA shows paths left by walking astronauts, single lines, and lunar buggy tracks, parallel lines, from the 1972 U.S. Apollo 17 moon mission. NASA's Lunar Reconnaissance Orbiter made this and other photographs of lunar landing sites from 13 to 15 miles above the moon's surface. (AP Photo/NASA)

Associated Press
This August 2011 image made available by NASA shows paths left by walking astronauts, single lines, and lunar buggy tracks, parallel lines, from the 1972 U.S. Apollo 17 moon mission. NASA's Lunar Reconnaissance Orbiter made this and other photographs of lunar landing sites from 13 to 15 miles above the moon's surface. (AP Photo/NASA)
This August 2011 image made available by NASA shows paths left by walking astronauts, single lines, and lunar buggy tracks, parallel lines, from the 1972 U.S. Apollo 17 moon mission. NASA's Lunar Reconnaissance Orbiter made this and other photographs of lunar landing sites from 13 to 15 miles above the moon's surface. (AP Photo/NASA)
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