When we look up at the Moon, we always see the same side. This peculiarity results because the Moon rotates just once for every orbit it makes around the Earth.
It has long been a theory of some UFOlogists that the far side of the Moon could harbor a base for extraterrestrials. Presuming they come from a distant planet in some other solar system, they must have a base from which they can make their regular visits to the Earth. What better place than the far side of the Moon, which is perpetually hidden from sight?
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Unseen Horrors Kevin MacLeod (incompetech.com)
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