Astronaut David Scott (b1932) on the slope of Hadley Delta during Apollo 15, 1971.Artist: NASA

Astronaut David Scott (b1932) on the slope of Hadley Delta during Apollo 15, 1971. David Scott, mission commander, performs a task at the Lunar Roving Vehicle parked on the edge of Hadley Rille during the first Apollo 15 lunar surface extravehicular activity (EVA-1). This photograph was taken by Astronaut James B. Irwin, lunar module pilot, from the flank of St George Crater. The view is looking north along the rille. (Photo by The Print Collector/Print Collector/Getty Images)