"That's one small step for man, one giant leap for mankind."
However, astronauts have said many other things upon reaching the Moon, and the specific phrase depends on the mission and the astronaut.
Here are some examples:
* Buzz Aldrin: "Magnificent desolation." (Describing the lunar surface)
* David Scott: "It has been said that man's destiny lies in the stars. In this century, it's time we get to know the stars a little better."
* Eugene Cernan: "America's challenge of today has forged man's destiny of tomorrow. And as we leave the Moon at Taurus-Littrow, we leave as we came and as we will return - with peace and hope for all mankind."
Ultimately, the astronauts' exact words upon reaching the Moon varied depending on the individual and the moment, but they all conveyed a sense of wonder, accomplishment, and a profound connection with the universe.