Tranquility Base () is the site on the Moon where, in July 1969, humans landed and walked on another celestial body than Earth for the first time. On July 20, 1969, Apollo 11 crewmembers Neil Armstrong and Buzz Aldrin landed their Apollo Lunar Module "Eagle" at approximately 20:17:40 UTC. Armstrong exited the spacecraft six hours 39 minutes after touchdown, followed 19 minutes later by Aldrin. The astronauts spent two hours 31 minutes examining and photographing the lunar surface, setting up several scientific experiment packages, and collecting of dirt and rock samples for return to Earth. They lifted off the surface on July 21 at 17:54 UTC.