There are several sets of mirrors on the Moon that are used to reflect laser beams back to Earth. These mirrors, known as retroreflectors, are used in a technique called laser ranging, which allows scientists to measure the distance between the Earth and the Moon with high precision. The first retroreflectors were placed on the Moon during the Apollo 11, 14, and 15 missions in the late 1960s and early 1970s.
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See episode "Adam Ruins Conspiracy Theories" of Adam Ruins Everything. He debunks the idea that the moon landing could have been faked with the technology of that day.
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https://www.pbs.org/newshour/science/apollo-landing-footage-would-have-been-impossible-to-fake-a-film-expert-explains-why
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