Apollo 11 was the spaceflight that landed the first two humans on the .
Neil Armstrong and Buzz Aldrin, two astronauts, reached the lunar surface on July 20, 1969.
After landing, the two astronauts spent about two hours together outside the ,
and collected 47.5 (21.5 kg) of lunar material to bring
back to .
While they were on the surface, Michael Collins piloted the Columbia in lunar orbit.
Armstrong and Aldrin spent almost a full day on the lunar surface before returning to the Columbia. The three astronauts returned to and
landed in the Pacific on July 24.