On July 20, 1969, Apollo 11 astronauts Neil Armstrong and Buzz Aldrin became the first men to set foot on the moon.
The Apollo 11 spacecraft took off from Kennedy Space Center on 9:32 a.m. EDT on July 16 with Armstrong, Edwin "Buzz" Aldrin Jr., and Michael Collins on board. Soon after reaching lunar orbit about 76 hours into the mission, Armstrong and Aldrin entered the lunar module, the Eagle, and separated from the command module, the Columbia.
Armstrong guided the Eagle onto the moon's surface, but not without trouble. The module's computer erroneously sounded alarms and just 30 seconds worth of fuel was left when it touched down on the Sea of Tranquility at 4:18 p.m., on July 20 according to NASA.
"Houston, Tranquility Base here," Armstrong radioed. "The Eagle has landed."
More than six hours later, at 10:56 p.m., Armstrong took the first steps out onto the moon's surface.
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July 20 is also the birthday of Sir Edmund Hillary, who famously became the first man to climb Mount Everest.