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Retroreflectors are devices which reflect light back to its source. Six were left at six sites on the Moon by three crews of the Apollo program, two by remote landers of the Lunokhod program, and one by the Chandrayaan program. [1] Lunar reflectors have enabled precise measurement of the Earth–Moon distance since 1969 using lunar laser ranging.
Apollo 17. Apollo 17 (December 7–19, 1972) was the eleventh and final mission of NASA 's Apollo program, the sixth and most recent time humans have set foot on the Moon or traveled beyond low Earth orbit. Commander Gene Cernan and Lunar Module Pilot Harrison Schmitt walked on the Moon, while Command Module Pilot Ronald Evans orbited above.
The history of traffic lights is associated with the historic growth of the automobile. [1] Traffic lights were first introduced in December 1868 on Parliament Square in London to reduce the need for police officers to control traffic. [2] Since then, electricity and computerised control has advanced traffic light technology and increased ...
Ten lunar modules were launched into space. Of these, six were landed by humans on the Moon from 1969 to 1972. The first two flown were tests in low Earth orbit: Apollo 5, without a crew; and Apollo 9 with a crew. A third test flight in low lunar orbit was Apollo 10, a dress rehearsal for the first landing, conducted on Apollo 11.
For 40 years Armstrong's and Aldrin's space suits were displayed in the museum's Apollo to the Moon exhibit, [242] until it permanently closed on December 3, 2018, to be replaced by a new gallery which was scheduled to open in 2022. A special display of Armstrong's suit was unveiled for the 50th anniversary of Apollo 11 in July 2019.
This is an accepted version of this page This is the latest accepted revision, reviewed on 24 September 2024. Second crewed Moon landing Apollo 12 Commander Pete Conrad studies the Surveyor 3 spacecraft, which had landed two years previously; the Apollo Lunar Module, Intrepid, can be seen at top right. Mission type Crewed lunar landing (H) Operator NASA COSPAR ID CSM: 1969-099A LM: 1969-099C ...
Traffic lights were first introduced in December 1868 on Parliament Square in London to reduce the need for police officers to control traffic. [6] Since then, electricity and computerised control has advanced traffic light technology and increased intersection capacity. [7]
Objects at greater than 90 degrees east or west are on the far side of the Moon, including Ranger 4, Lunar Orbiter 1, Lunar Orbiter 2, Lunar Orbiter 3, Chang'e 4 lander and Yutu-2 rover. Because of increasing numbers of missions to and objects at the Moon, a global registry of lunar activities has been proposed in 2023 by the Open Lunar Foundation.