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July 20, 1969
Apollo 11 — Armstrong and Aldrin walk on the Moon
Experience this missionApollo 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.
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.'
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-fifth of humanity — 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.
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.
“That's one small step for [a] man, one giant leap for mankind.”
Mission Data
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
Key Facts
Of Saturn V's 3,000-tonne liftoff mass, only 21.5 kg of lunar rock and 5 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
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.
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Experience
Apollo 11
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Buzz Aldrin
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Astronaut
Michael Collins
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Mission
Apollo 11
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