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  2. Zoo hypothesis - Wikipedia

    en.wikipedia.org/wiki/Zoo_hypothesis

    Extraterrestrial life forms might, for example, choose to allow contact once the human species has passed certain technological, political, and/or ethical standards. Alternatively, they may withhold contact until humans force contact upon them, possibly by sending a spacecraft to an extraterrestrial-inhabited planet. In this regard, reluctance ...

  3. Extraterrestrial UFO hypothesis - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_UFO...

    The extraterrestrial hypothesis (ETH) proposes that some unidentified flying objects (UFOs) are best explained as being physical spacecraft occupied by extraterrestrial intelligence or non-human aliens, or non-occupied alien probes from other planets visiting Earth. In spite of ardent believers that various UFO sightings are verifiable evidence ...

  4. Dark forest hypothesis - Wikipedia

    en.wikipedia.org/wiki/Dark_forest_hypothesis

    The dark forest hypothesis is a special case of the "sequential and incomplete information game" in game theory. [14] [9] [15] In game theory, a "sequential and incomplete information game" is one in which all players act in sequence, one after the other, and none are aware of all available information. [16]

  5. Fermi paradox - Wikipedia

    en.wikipedia.org/wiki/Fermi_paradox

    This is an accepted version of this page This is the latest accepted revision, reviewed on 17 January 2025. Problem of the lack of evidence for alien life despite its apparent likelihood This article is about the absence of clear evidence of extraterrestrial life. For a type of estimation problem, see Fermi problem. Enrico Fermi (Los Alamos 1945) The Fermi paradox is the discrepancy between ...

  6. Interdimensional UFO hypothesis - Wikipedia

    en.wikipedia.org/wiki/Interdimensional_UFO...

    The interdimensional hypothesis is a proposal that unidentified flying object (UFO) sightings are the result of experiencing other "dimensions" that coexist separately alongside our own [1] in contrast with either the extraterrestrial hypothesis that suggests UFO sightings are caused by visitations from outside the Earth or the psychosocial hypothesis that argues UFO sightings are best ...

  7. Extraterrestrial intelligence - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_intelligence

    The extraterrestrial hypothesis is the idea that some UFOs are vehicles containing or sent by extraterrestrial beings (usually called aliens in this context). [13] As an explanation for UFOs, ETI is sometimes contrasted with EDI (extradimensional intelligence) , for example by J. Allen Hynek . [ 24 ]

  8. Time-traveler UFO hypothesis - Wikipedia

    en.wikipedia.org/wiki/Time-traveler_UFO_hypothesis

    Later, the dwarf-like alien scientist Dr. Z'ong reveals to Mortimer that commander Basam Damdu, absolute dictator of the Yellow Empire from The Secret of the Swordfish, along with his army, including Zong himself, are humans from 8061, a time when the earth is deserted due to a long nuclear war in the 21st century and humans are an endangered ...

  9. Extraterrestrial: The First Sign of Intelligent Life Beyond Earth

    en.wikipedia.org/wiki/Extraterrestrial:_The...

    The book describes the 2017 detection of ʻOumuamua, the first known interstellar object to pass through the Solar System. [8] [9] Loeb, an astronomer at Harvard University, speculates that the object might be an extraterrestrial artifact, [10] a suggestion considered unlikely by the scientific community collectively.