One theory which can no longer be taken very seriously is that UFOs are interstellar spaceships.
Nowhere in space will we rest our eyes upon the familiar shapes of trees and plants, or any of the animals that share our world. Whatsoever life we meet will be as strange and alien as the nightmare creatures of the ocean abyss, or of the insect empire whose horrors are normally hidden from us by their microscopic scale.
The phenomenon of UFO doesn't say anything about the presence of intelligence in space. It just shows how rare it is here on the earth.
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