Common
Cryptoterrestrial UFO hypothesis
Suggestion of an alien civilization on Earth
Cryptoterrestrial UFO hypothesis
The cryptoterrestrial UFO hypothesis proposes that reports of flying saucers or UFOs are evidence of a hidden, Earth-based, technologically advanced civilization. Aaron John Gulyas, a scholar of conspiracy theories, characterized the hypothesis as "really more of a thought experiment designed to raise questions", while others note that "even people open to the cryptoterrestrial hypothesis remain skeptical".
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