For one moment, every human on Earth looked up at the same thing.

One Giant Leap: Humans Set Foot on the Moon

Apollo 11 lands on the lunar surface, fulfilling Kennedy's promise

On July 20, 1969, Neil Armstrong became the first human to walk on the Moon, as 600 million people watched live on television.

At 10:56 PM EDT on July 20, 1969, Neil Armstrong descended the ladder of the Eagle lunar module and placed his left foot on the surface of the Moon. "That's one small step for man, one giant leap for mankind," he said — a line heard by 600 million people watching on television, a fifth of humanity.

The achievement culminated a decade of extraordinary effort. President Kennedy had declared in 1961 that America would reach the Moon before the decade's end — a nearly impossible goal given that NASA had only 15 minutes of human spaceflight experience at the time. Over the following years, the Mercury and Gemini programs solved one problem at a time: life support, spacewalks, orbital rendezvous, reentry.

Apollo 11 launched on July 16. Four days later, Armstrong and Buzz Aldrin landed in the Sea of Tranquility while Michael Collins orbited above. Armstrong and Aldrin spent two hours and 31 minutes on the surface, collecting 47.5 pounds of lunar samples and planting an American flag.

The Moon landing represented the culmination of a Cold War space race that had been driven as much by ideology as scientific curiosity. Yet its legacy transcends politics. The systems developed for the pro…

💡 The Apollo Guidance Computer that navigated humans to the Moon had less processing power than a modern greeting card that plays music.