Apollo 11

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NASA

Fifty years ago today, this Saturn V booster roared off Launch Pad 39A with a half billion people around the world watching.  Atop the rocket, Neil Armstrong, Edwin Aldrin, and Michael Collins were prepped for lunar landing.  The launch of Apollo 11 marked the start of one of the most important events in human history and one for which the entire world cheered.  NASA.gov gives extensive coverage of the flight, including this post.