On July 20, 1969, Apollo 11 mission commander Neil Armstrong descended the ladder to take the first step by a human being on another celestial body -- and then photographed Buzz Aldrin taking the second step, pictured here. Aldrin snapped his bootprint in the lunar soil. After 2 1/2 hours walking around on the surface, they re-entered the Eagle. Its re-ascent was caught by Mike Collins, waiting in the orbiting Columbia.
(Photo: CBS)
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