Extraterrestrial intelligent life

Extraterrestrial intelligent life, also called extraterrestrial intelligence (ETI), is intelligent life originating away from Earth — the intelligent subset of extraterrestrial life and the off-Earth domain of the broader, origin-neutral non-human intelligence. At the level of the individual, such a life form is an extraterrestrial being (also called an extraterrestrial, an ET or a space alien), an intelligent being that originates beyond Earth and is either a non-human intelligent being or, among the off-world human populations, an extraterrestrial human; at the level of a society it is an extraterrestrial civilization, understood as the long-term result of intelligent and specifically sapient extraterrestrial life. The question of whether other inhabited worlds exist has been debated since antiquity, and took its modern form when the Copernican Revolution recast Earth as one planet revolving around the Sun and the other planets, conversely, as other worlds. It is distinct from its portrayal in fiction and, as an explanation for unidentified craft, from the competing extradimensional reading.

In mainstream science the concept is treated as hypothetical: no extraterrestrial intelligence has been verifiably observed, and the subject is held to be among the most speculative questions in science even as it remains a central theme of science fiction and popular culture. The exopolitics and disclosure literature documented in this encyclopedia takes the opposite starting point — that non-human intelligences are already present and interacting with Earth, a reality held to be evidenced by witness and whistleblower testimony, alleged crash retrievals of craft and their occupants, and a sustained record of contact — and reads the official "no evidence" posture not as a neutral finding but as a managed one, maintained through UAP secrecy under the controlling structures described as the cabal. The two readings frame the same subject from opposite ends: officially unconfirmed and improbable versus documented-but-suppressed — a tension that, by design, is difficult to close, since each side can read the absence of undeniable public proof as support for its own position.

Terminology

Two overlapping vocabularies attach to the idea. Intelligence, together with the more precise concept of sapience, is used for extraterrestrial life with cognitive abilities comparable to humans; an interchangeable term is sophoncy — being wise or wiser — coined by Karen Anderson and published in the 1966 works of her husband Poul Anderson. Sentience, like consciousness, is sometimes mistakenly substituted for intelligence and sapience, though it does not exclude forms of life that are non-sapient or non-conscious.

An alternative name is "Extraterrestrial Technological Instantiations" (also ETI), coined to sidestep terms such as "civilizations", "species", and "intelligence", which may prove ambiguous, open to interpretation, or simply inapplicable in a given context.

Extraterrestrial beings

An individual member of extraterrestrial intelligent life is called an extraterrestrial being, an extraterrestrial, an ET or a space alien. In the usage of extraterrestrial life, where such beings are colloquially called aliens, they might range from simple forms such as microbes to intelligent beings, possibly bringing forth civilizations that might be far more, or far less, advanced than humans.

Extraterrestrial beings form the baseline position against which the rival interdimensional, ultraterrestrial, cryptoterrestrial, and extratempestrial models of non-human contact define themselves, each proposing that some or all of what is attributed to off-world visitors instead arises from beings native to Earth's own environment, to adjacent dimensions, or to Earth's own future. As a being-level category, extraterrestrials sit within the broader, origin-neutral class of non-human intelligent beings alongside terrestrial beings and cryptoterrestrials (including subterranean nonhuman intelligent beings), from which an off-world origin distinguishes them; the category also includes extraterrestrial humans, biologically human populations of off-world origin or residence. In practice the categories overlap: the Zenae of Andromeda are extraterrestrial in origin but employ interdimensional and time travel, and reptilian species such as the Draco reptilians are extraterrestrial in origin (from Alpha Draconis) yet have maintained a terrestrial presence for millennia, blurring the line with cryptoterrestrial classification; the umbrella term "non-human intelligent beings" was adopted in government and research usage precisely to avoid presupposing any single origin.

The term is looser than its dictionary form suggests. Read purely spatially, any being currently beyond Earth — a human astronaut on the Moon as much as a visiting non-human — satisfies the definition, while a non-human being physically present on Earth technically does not, however alien its origin; casual and technical usage diverge on exactly this point. In ordinary contact and disclosure usage the word is reserved for beings understood as members of an extraterrestrial civilization — a society or polity native to another world — so that it is civilizational membership, rather than momentary location, that fixes whether a being counts as extraterrestrial in the sense the literature actually uses. The Galactic Federation of Worlds is described as having deprecated "extraterrestrial" in favor of "non-human intelligence," on the grounds that many "ET" beings are not strictly space-travelers but operate across dimensional or temporal boundaries the spatial prefix fails to capture.[citation needed]

Official and disclosure-era terms

The terminology used to describe non-human beings visiting Earth is itself contested. The government and military use "UAP" (Unidentified Anomalous Phenomena) as the current institutionally preferred term, deliberately non-committal on origin, while David Grusch and other whistleblowers used "non-human intelligence" and "non-human origin technical vehicles" in formal settings such as the 2023 UAP Congressional Hearing. Steven Greer, founder of the Disclosure Project, has objected to the term "NHI," calling it a product of the "CIA psychological warfare Division that has the linguistics department." Since 2023 the term "NHI" has served in official usage as a replacement label for extraterrestrial intelligence[citation needed] and takes in the radio-astronomy search programs, the Fermi paradox, and the evidentiary claims of ufology, exopolitics, and contactee traditions; Luis Elizondo says there is "overwhelming evidence that there is non-human intelligence interacting with our planet and potentially our species."

Debate through history

The possibility of other inhabited worlds is an old one, argued from Democritus and the ancient atomists onward, but its modern form is a consequence of the Copernican Revolution: once the Earth was understood as a planet, the other planets became candidate worlds and the question of their inhabitants a natural corollary. The same reasoning is generalized in the Copernican principle and its relativistic extension — the proposition that humans are not privileged observers of the universe.

Speculation about inhabited worlds beyond Earth also drew early Christian writers: Augustine discussed ideas from thinkers like Democritus and Epicurus about countless worlds in the vast universe. Pre-modern writers typically assumed that extraterrestrial "worlds" were inhabited by living beings: in the 15th century William Vorilong allowed that Jesus could have visited extraterrestrial worlds to redeem their inhabitants, in 1440 Nicholas of Cusa theorized that all celestial bodies, even the Sun, could host life, and Descartes wrote that there were no means to prove the stars were not inhabited by "intelligent creatures," though their existence was a matter of speculation.

The modern use of "extraterrestrial" in the UFO/contact context dates to the post-World War II period and the 1947 Roswell recovery. The term "flying saucer" — coined by press misquoting pilot Kenneth Arnold's 1947 description — was quickly paired with "extraterrestrial" as the dominant explanatory framework for unidentified craft, framing the phenomenon as space visitors consistent with the concurrent science-fiction genre. Earlier contact traditions — the Vril Society, Thule Society, and pre-war spiritualist channels — used different vocabulary (cosmic beings, Venusians, space brothers) that has since been superseded.

Probability

Many prominent scientists, including the astrophysicist Stephen Hawking, have argued that the sheer scale of the universe makes it improbable for intelligent life not to have emerged elsewhere. Against this, the Fermi paradox sets the apparent contradiction between such high estimates and humanity's lack of officially acknowledged contact with, or accepted evidence for, extraterrestrial civilizations. Within the disclosure literature the paradox is treated as already resolved in favour of contact: the "great silence" is read not as absence but as concealment and non-interference — the intelligences held to be present, their presence managed rather than announced — so that on the mainstream account no life has been observed, while on the exopolitics account it has been observed and withheld.

Two scales frame the discussion quantitatively. The Kardashev scale gauges a civilization's technological advancement by the amount of energy it can harness, and the Drake equation is a probabilistic formula used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way.

Search for extraterrestrial intelligence

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Search for extraterrestrial intelligence

The instrumental search for extraterrestrial intelligence has run for several decades without a significant confirmed result. Active SETI (Active Search for Extra-Terrestrial Intelligence) inverts the effort, attempting to send messages to intelligent extraterrestrial life, usually as radio signals; a physical artefact such as the Pioneer plaque may also be considered an active-SETI message. Communication with extraterrestrial intelligence (CETI) is the branch concerned with composing and deciphering messages that another technological civilization could in principle understand; the best-known CETI experiment was the 1974 Arecibo message composed by Frank Drake and Carl Sagan.

The U.S. government's stated position, in line with most relevant experts, is that "chances of contact with an extraterrestrial intelligence are extremely small, given the distances involved." That same publicly issued denial of visitation and cover-up is, in the disclosure reading, precisely the kind of official statement that later whistleblower testimony contradicts. The distance argument has also led some to reason that first contact might be made with extraterrestrial artificial intelligence rather than with biological beings — a proposition that converges with accounts in the contact literature of largely synthetic Grey populations described as cloned and machine-controlled rather than biologically reproducing.

The Wow! signal remains the best candidate for an extraterrestrial radio signal ever detected, although the absence of any repeat makes attribution to any cause difficult if not impossible. On 14 June 2022 astronomers working with China's FAST telescope reported the possible detection of artificial (presumably alien) signals, while cautioning that further study was needed to rule out natural radio interference; on 18 June 2022 Dan Werthimer, chief scientist for several SETI projects, reported that "these signals are from radio interference; they are due to radio pollution from earthlings, not from E.T." In the disclosure reading a decades-long null result from radio search bears little on the question of contact, since the contact alleged in the witness record is physical and terrestrial rather than a distant transmission.

As an explanation for unidentified craft

The extraterrestrial hypothesis holds that some UFOs are vehicles containing or sent by extraterrestrial beings, so that UFO occupants are beings from extraterrestrial civilizations and/or such beings are the agency behind reported alien encounters. As an explanation for such craft, ETI is sometimes contrasted with extradimensional intelligence (EDI) — the interdimensional hypothesis associated with ultraterrestrial and Vallée-type readings — a distinction drawn, for example, by the astronomer and Project Blue Book consultant J. Allen Hynek. The question moved into open government proceedings in 2023, when House lawmakers held a hearing to examine how the executive branch handles reports of UFOs, at which the former intelligence officer David Grusch testified to a concealed crash-retrieval program — the point at which the mainstream "no evidence" position and the disclosure record most directly collide.

Potential impact of contact

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Potential cultural impact of extraterrestrial contact

The consequences of contact could vary greatly in magnitude and kind, depending on the other civilization's level of technological advancement, its degree of benevolence or malevolence, and the level of mutual comprehension between it and humanity; some accounts suggest a civilization advanced enough to dispense with biology, living instead within advanced computers. The medium of contact — electromagnetic radiation, direct physical interaction, an extraterrestrial artefact, or otherwise — may itself shape the outcome. A technologically superior contact has often been likened to the meeting of two vastly different human cultures, with the Columbian Exchange as historical precedent; because such meetings have generally destroyed the civilization receiving contact rather than the one initiating it, destruction of human civilization is treated as a possible outcome. The anticipated psychological and societal disruption of confirmed contact is treated in the disclosure literature as ontological shock, and is cited as a stated rationale for gradual rather than sudden disclosure.

In culture

The probability of intelligent life has been a recurring cultural theme, particularly since the prospect and achievement of spaceflight. In 2003 the state of New Mexico declared 14 February Extraterrestrial Culture Day.

See also

• Non-human intelligent being
• Extraterrestrial civilization
• Extraterrestrial humans
• Extraterrestrial biological entity
• J-Rod
• Alien-human relations
• Biology of non-human intelligent beings
• Extraterrestrial life
• Extraterrestrial hypothesis
• Interdimensional hypothesis
• Rare Earth hypothesis
• Cosmic pluralism
• Quiet and loud aliens
• Life origination beyond planets
• Sentiocentrism
• Extraterrestrial: The First Sign of Intelligent Life Beyond Earth, 2021 popular-science book by Avi Loeb

References

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This article incorporates material from the Wikipedia article "Extraterrestrial intelligent life", as of 2024-09-20, released under the Creative Commons Attribution-ShareAlike 4.0 License.