Astronaut Edwin E. Aldrin Jr., lunar module pilot, moves toward a position to deploy two components of the Early Apollo Scientific Experiments Package (EASEP) on the surface of the Moon during the Apollo 11 extravehicular activity. The Passive Seismic Experiments Package (PSEP) is in his left hand; and in his right hand is the Laser Ranging Retro-Reflector (LR3). Astronaut Neil A. Armstrong, commander, took this photograph with a 70mm lunar surface camera.
A total of 12 people have walked on the moon — all of them men, and all part of NASA's Apollo program between 1969 and 1972.
While hundreds of astronauts have traveled to space, only a select few have ever set foot on another world. The moon, Earth's only natural satellite, lies just 238,855 miles (384,400 kilometers) away, but remains one of the most exclusive destinations in human history.
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