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On July 20, 1969, humans walked on another world for the first time in history, achieving the goal that President John F. Kennedy had set in 1961, before Americans had even orbited the Earth. After a landing that included dodging a lunar crater and boulder field just before touchdown, Neil Armstrong and Buzz Aldrin explored the area around their lunar landing site for more than two hours. Apollo 11 (July 16–24, 1969) was the American spaceflight that first landed humans on the Moon. Commander Neil Armstrong and Lunar Module Pilot Buzz Aldrin landed the Apollo Lunar Module Eagle on July 20, 1969, at 20:17 UTC, and Armstrong became the first person to step onto the Moon's surface six hours and 39 minutes later, on July 21 at 02:56 UTC. Aldrin joined him 19 minutes later, and they spent about two and a quarter hours together exploring the site they had named Tranquility Base upon landing.