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Extraterrestrial intelligence (often abbreviated ETI) refers to hypothetical intelligent extraterrestrial life. The question of extraterrestrial intelligence and the existential question "Are we alone in the universe?" is one of the oldest and most popular in science and is a popular theme in science fiction.〔(Are we alone? ) Peter Spinks. May 21, 2013.〕 The basic assumption behind the existence of extraterrestrial intelligence is inferred from the existence of human intelligence and the size of the known universe. ==Probability== The Copernican principle is generalized to the relativistic concept that humans are not privileged observers of the universe. Many prominent scientists, including Stephen Hawking have proposed that the sheer scale of the universe makes it improbable for intelligent life not to have emerged elsewhere. However Fermi's Paradox highlights the apparent contradiction between high estimates of the probability of the existence of extraterrestrial civilization and humanity's lack of contact with, or evidence for, such civilizations. The Kardashev scale is a method of measuring a civilization's level of technological advancement, based on the amount of energy a civilization is able to utilize.〔 Kardashev, Nikolai. "(On the Inevitability and the Possible Structures of Supercivilizations )", The search for extraterrestrial life: Recent developments; Proceedings of the Symposium, Boston, MA, June 18–21, 1984 (A86-38126 17-88). Dordrecht, D. Reidel Publishing Co., 1985, p. 497–504.〕 The Drake equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Extraterrestrial intelligence」の詳細全文を読む スポンサード リンク
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