The Apache Point Observatory Lunar Laser-ranging Operation (APOLLO) is a scientific project focused on performing precise measurements of the distance between the Earth and the Moon using laser-ranging techniques. This operation utilizes a telescope located at the Apache Point Observatory in New Mexico, USA, to bounce laser beams off retroreflectors that were left on the lunar surface by Apollo missions (Apollo 11, 14, and 15) and the Russian Lunokhod missions.
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