Extraterrestrial intelligence

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Extraterrestrial intelligence (often abbreviated ETI) refers to hypothetical intelligent extraterrestrial life.

There has been a search for signals from extraterrestrial intelligence for several decades (SETI), with no solid results.[1]

The extraterrestrial hypothesis is the idea that some UFOs are vehicles containing or sent by extraterrestrial beings (usually called aliens in this context).[1] As an explanation for UFOs, ETI is sometimes contrasted with EDI (extradimensional intelligence), for example by Allen Hynek.[2]


  1. ^ a b "The search for ET is a detective story without a body" by Nigel Henbest, New Scientist, March 9, 2013, p. 53.
  2. ^ Fuller, Curtis (1980). Proceedings of the First International UFO Congress. New York: Warner Books. , pp. 157-63.