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Just 12 people have walked on the moon, all between 1969 and 1972. Here’s the full list:

Neil Armstrong, Apollo 11 (1969)

Edwin “Buzz” Aldrin, Apollo 11 (1969)

Charles “Pete” Conrad, Apollo 12 (1969)

Alan L. Bean, Apollo 12 (1969)

Alan Shepard, Apollo 14 (1971)

Edgar D. Mitchell, Apollo 14 (1971)

David Scott, Apollo 15 (1971)

James B. Irwin, Apollo 15 (1971)

John Young, Apollo 16 (1971)

Charles M. Duke Jr., Apollo 16 (1971)

Eugene A. Cernan, Apollo 17 (1972)

Harrison “Jack” Schmitt, Apollo 17 (1972)

As of June 2019, just four moon-walkers remained alive: Aldrin, Scott, Duke and Schmitt. Schmitt, a geologist, was the only trained scientist to visit the moon.