July 20, 1969Sea of Tranquility, the Moon · 20:17 UTC (touchdown)NASA
Before today, no human had stood on another world. After today, two had walked on the Moon.
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The world that day
3.6 billion
People on Earth
2
Nations to launch a human
2
Humans to walk on the Moon
0
Known worlds beyond the Sun
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Apollo 11 launched on 16 July 1969 on a Saturn V rocket from Kennedy Space Center's Launch Complex 39A, carrying Commander Neil Armstrong, Command Module Pilot Michael Collins, and Lunar Module Pilot Buzz Aldrin. After a three-day transit, the spacecraft entered lunar orbit on 19 July.
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On 20 July at 20:17 UTC, the Eagle lunar module touched down in the Sea of Tranquility — four miles from the planned site after Armstrong flew past a boulder field with less than 30 seconds of fuel remaining. 'The Eagle has landed,' he reported. Mission Control replied: 'You got a bunch of guys about to turn blue. We're breathing again.'
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At 02:56 UTC on 21 July, Armstrong descended the ladder and stepped onto the Moon. 'That's one small step for [a] man, one giant leap for mankind.' An estimated 600 million people — one in six humans then alive — watched live on television. Aldrin followed 19 minutes later. The pair spent 2 hours and 31 minutes on the surface, planting a flag, collecting 21.5 kg of samples, and placing seismic and laser-retroreflector instruments.
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The crew returned to Earth on 24 July, splashing down in the Pacific south-west of Hawaii and entering 21 days of biological quarantine as a precaution against potential lunar pathogens. The mission achieved Kennedy's 1961 challenge with five months to spare — and has never been surpassed in public impact.
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That's one small step for [a] man, one giant leap for mankind.
Neil Armstrong · Sea of Tranquility, Moon — 20 July 1969
By the numbers
Launch date
16 Jul 1969
Moon landing
20 Jul 1969, 20:17 UTC
Mission duration
8 days, 3 hr
Lunar EVA
2 hr 31 min
Samples returned
21.5 kg
Splashdown
24 Jul 1969
Why it mattered
Apollo 11 proved that humans could leave Earth, travel to another world, and return safely. It remains the most audacious engineering achievement in human history — and the single event that reshaped humanity's relationship with space from science fiction to lived reality.
▸Of Saturn V's 3,000-tonne liftoff mass, only 21.5 kg of lunar rock and 3 astronauts actually returned — the rest was fuel and stages discarded along the way
▸Armstrong flew past a boulder field during landing with less than 30 seconds of fuel remaining, manually selecting a safe site in real time
▸A 1202 'executive overflow' alarm nearly caused an abort — engineers recognised it as a non-critical interrupt and waved off the abort with four seconds to spare
▸The crew entered 21-day biological quarantine on return, in case of unknown lunar pathogens — a precaution lifted after Apollo 14
▸An estimated 600 million people — one in every six humans alive — watched the Moon landing live on television
