Extraterrestrial intelligence

Extraterrestrial intelligence (often abbreviated ETI), or non-human intelligence (NHI), refers to hypothetical intelligent extraterrestrial life. No such life has ever been proven to exist in the Solar System except for humans on Earth, and its existence in other star systems is still speculative.^[1] The question of whether other inhabited worlds might exist has been debated since ancient times.^[2] 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.^[3] 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 science fiction and popular culture.^[4]

^ Bennett, Jeffrey (2017). Life in the universe. United States: Pearson. p. 3-4. ISBN 978-0-13-408908-9.
^ Plurality of Worlds: The Extraterrestrial life Debate from Democritus to Kant, by Steven Dick, Cambridge University Press 1984
^ The Extraterrestrial Life Debate: 1750-1900, by Michael J. Crowe, Dover Publications, 2011
^ Are we alone? Peter Spinks. May 21, 2013.

[1] Bennett, Jeffrey (2017). Life in the universe. United States: Pearson. p. 3-4. ISBN 978-0-13-408908-9.

[2] Plurality of Worlds: The Extraterrestrial life Debate from Democritus to Kant, by Steven Dick, Cambridge University Press 1984

[3] The Extraterrestrial Life Debate: 1750-1900, by Michael J. Crowe, Dover Publications, 2011

[4] Are we alone? Peter Spinks. May 21, 2013.

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