The Moon is a Hollow Spacecraft
Several science fiction books of the early 20th century, including H.G. Wells’ The First Men in the Moon, take place within a hollow moon inhabited by aliens. In 1970 two Soviet scientists took this seemingly whimsical premise a step further, proposing that the moon is actually a shell-like alien spacecraft built by extraterrestrials with superior technology and intelligence.
According to astronomers, the moon—though admittedly enigmatic as far as celestial bodies go—couldn’t maintain its mass and gravitational field if it lacked a dense core. (Read Hollow Moon)
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