On July 20, 1969, at 10:56 p.m. EDT, American astronaut Neil Armstrong, 240,000 miles from Earth, communicates with Mission Control as he takes "one small step" off the Eagle landing module and onto the moon.

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In This Day in History video clip: At 10:56 p.m. EDT, American astronaut Neil Armstrong, 240,000 miles from Earth, speaks these words to more than a billion people listening at home: "That's one small step for man, one giant leap for mankind." This video clip is courtesy of The History Channel.

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