Tranquility Base is the site on the Moon where, in July 1969, American NASA astronauts landed and walked on a celestial body other than Earth for the first time. On July 20, 1969, Apollo 11 crewmember
Astronaut Buzz Aldrin with Apollo Lunar Module Eagle at Tranquility Base; photo taken by Neil Armstrong
The plaque left at Tranquility Base on the Lunar Module Descent Stage which commemorates the first crewed lunar landing (photographed by Neil Armstrong)
Lunar Orbiter 5 image from 1967, cropped to show the vicinity of the landing site of Apollo 11, used in mission planning. The image is centered precisely on a small crater called West crater (190 m in diameter), and the Lunar Module Eagle touched down about 550 m west of West Crater. The area shown is approximately 25 km × 25 km across.
High-resolution Lunar Orbiter 5 image cropped to show the landing site of Apollo 11. The landing site is indicated by a red dot. The prominent crater at right is called West crater and is about 190 m in diameter.
Mare Tranquillitatis is a lunar mare that sits within the Tranquillitatis basin on the Moon. It contains Tranquility Base, the first location on another celestial body to be visited by humans.
The Sea of Tranquility of the Moon
The Apollo 11 landing site at center, facing west, with the 22-kilometer-wide Maskelyne crater in right foreground
The Moon with Mare Tranquillitatis highlighted and the first crewed lunar landing marked
Buzz Aldrin salutes the U.S. flag on Mare Tranquillitatis during Apollo 11 in 1969.