Extraterrestrial intelligence
intelligent extraterrestrial beings
Extraterrestrial intelligence (ETI) refers to hypothetical beings – extraterrestrial life or more artificial beings – having the intelligence to perform similar cognitive abilities as humans. No such life has ever been verifiably observed to exist. The question of whether other inhabited worlds might exist has been debated since ancient history. The modern form of the concept emerged when the Copernican Revolution demonstrated that the Earth was a planet revolving around the Sun, and other planets were, conversely, other worlds. The question of whether other inhabited planets or moons exist was a natural consequence of this new understanding. It has become one of the most speculative questions in science and is a central theme of both science fiction and popular culture.
An alternative name for it is "Extraterrestrial Technological Instantiations" (ETI). The term was coined to avoid the use of terms such as "civilizations", "species", and "intelligence", as those may prove to be ambiguous and open to interpretation, or simply inapplicable in its local context.
The search for extraterrestrial intelligence relies on technosignatures, the detectable effects of alien technological civilizations.
Intelligence
Intelligence is, along with the more precise concept of sapience, used to describe extraterrestrial life with similar cognitive abilities as humans.
The public source identifies “Extraterrestrial intelligence” as intelligent extraterrestrial beings. This brief keeps that definition visible, then builds a research path around Extraterrestrial, intelligence and intelligent.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Extraterrestrial intelligence”, the useful work is to connect “intelligent extraterrestrial beings” to the records capable of establishing context and consequence.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Jun 12, 2026. The linked authority identifier is Q15107669. The Library of Congress control number is sh2007000255. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
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Three-step research path
- Establish the record: confirm the title “Extraterrestrial intelligence”, its source revision and the description used here.
- Expand the search: follow Extraterrestrial intelligence primary sources, Extraterrestrial intelligence archive and Extraterrestrial research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
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This entry incorporates text from “Extraterrestrial intelligence” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.