Flight controllers celebratethe successful conclusion of the Apollo 11 lunar landing mission on July 24, 1969, at NASA's Mission Control Center in Houston. On July 20, Apollo 11 astronaut Neil Armstrong planted the first human foot on another world. With more than half a billion people watching on television, he climbed down the ladder and proclaimed: "That's one small step for a man, one giant leap for mankind." Image Credit: NASA

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