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 in which extraterrestrial beings are visiting Earth. When referring to such hypothetical visitors, the term alien is usually used.[1]
As an explanation for UFOs, ETI is sometimes contrasted with EDI (extradimensional intelligence), for example by Allen Hynek.[2]
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