Forty-five years ago, on July 20, 1969, man first walked on the moon.
Astronaut Neil Armstrong famously said that day as he became the first person to walk on the moon, "that is one small step for man, one giant leap for mankind." Fellow American astronaut Edwin "Buzz" Aldrin joined Armstrong on the moon a few minutes later.
In the middle of 1969, the United States was divided over the war in Vietnam, rocked by civil rights protests and still reeling from the 1968 assassinations of Martin Luther King, Jr. and presidential candidate Robert Kennedy. But the nation came together in July of that year to watch the historic Apollo 11 mission on television.
NASA estimates that more than half a billion people worldwide watched the televised lunar landing.
NASA astronauts returned to the moon on multiple missions; however, no human has touched down on the moon's surface since 1972.