: Astronomie: Lunar Laser Ranging experiment

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Lunar Laser Ranging experiment

Lunar Laser Ranging (LLR) is the practice of measuring the distance between the surfaces of the Earth and the Moon using laser ranging. The distance can be calculated from the round-trip time of laser light pulses travelling at the speed of light, which are reflected back to Earth by the Moon's surface or by one of five retroreflectors installed on the Moon during the Apollo program (11, 14, and 15) and Lunokhod 1 and 2 missions. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Lunar_Laser_Ranging_experiment)

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