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Suggestion of an alien civilization on Earth
The cryptoterrestrial hypothesis proposes that reports of flying saucers or UFOs are evidence of a hidden, Earth-based, technologically advanced civilization
Cryptoterrestrial_hypothesis
American novelist
Paracast. Tonnies developed the cryptoterrestrial hypothesis in his blog, and later in his third and last book Cryptoterrestrials, which was published posthumously
Mac_Tonnies
Thought experiment to assess ability to detect evidence of a prior advanced civilization
only the last few centuries. The idea has been connected to the cryptoterrestrial hypothesis explaining the existence of UFOs. The Silurians from Doctor Who
Silurian_hypothesis
Idea advanced by Ufologists
hypotheses: Demonic UFO hypothesis Cryptoterrestrial hypothesis Space animal hypothesis Time-traveler hypothesis Thanatological UFO hypothesis Layne, N. Meade
Interdimensional UFO hypothesis
Interdimensional_UFO_hypothesis
Hypothesis on animal lifeforms in space
spaceships Cryptoterrestrial hypothesis Demonic UFO hypothesis Extraterrestrial hypothesis Interdimensional hypothesis Psychosocial hypothesis Time-traveler
Space_animal_hypothesis
Concept developed by Ufologists
hypotheses: Cryptoterrestrial hypothesis Interdimensional hypothesis Thanatological UFO hypothesis Space animal hypothesis Demonic UFO hypothesis Psychosocial
Time-traveler_UFO_hypothesis
Proposal that UFO sightings are the result of a satanic influence
be demons Cryptoterrestrial hypothesis Extraterrestrial hypothesis Interdimensional hypothesis Psychosocial hypothesis Space animal hypothesis Thanatological
Demonic_UFO_hypothesis
Disproven hypothesis
fiction. Hollow Earth also recurs in conspiracy theories and the cryptoterrestrial hypothesis and is often said to be inhabited by mythological figures or
Hollow_Earth
Hypothesis that some unidentified flying objects are created by extraterrestrial life
life in the universe Chariots of the Gods? Cryptoterrestrial hypothesis David Icke Demonic UFO hypothesis Extraterrestrials in Meitei culture Fermi paradox
Extraterrestrial UFO hypothesis
Extraterrestrial_UFO_hypothesis
Interpretation proposing that some UFOs are linked to death and the afterlife
Interdimensional hypothesis Demonic UFO hypothesis Psychosocial hypothesis Time-traveler UFO hypothesis Cryptoterrestrial hypothesis Space animal hypothesis Extraterrestrial
Thanatological_UFO_hypothesis
Alleged extra-terrestrial beings
of an alien. The interdimensional hypothesis, the cryptoterrestrial hypothesis, and the time-traveller hypothesis attempt to provide an alternative explanation
Grey_alien
Hypothesis in ufology
Extraterrestrial hypothesis Interdimensional hypothesis Demonic UFO hypothesis Cryptoterrestrial hypothesis Mystery airship Space animal hypothesis Time-traveler
Psychosocial_UFO_hypothesis
Social movement about UFOs and aliens
proposed that UFOs might be of interdimensional origin. The cryptoterrestrial hypothesis proposes that reports of flying saucers or UFOs are evidence
Disclosure_movement
Pseudoscientific claims of past alien contact
Däniken's works, although it also received limited consideration as a serious hypothesis. Critics emerged throughout the 1970s, discrediting Von Däniken's claims
Ancient_astronauts
American writer and conspiracy theorist (1907–1975)
planet due to damaging radiation from the Sun: an example of a cryptoterrestrial hypothesis. Those ancients also abandoned some of their own offspring here
Richard_Sharpe_Shaver
extraterrestrial beings, alleged interdimensional beings, and alleged cryptoterrestrial beings that have been reported in close encounters, either claimed
List of alleged extraterrestrial beings
List_of_alleged_extraterrestrial_beings
Relating to abductions by otherworldly beings
UFO hypothesis Demonic UFO hypothesis Cryptoterrestrial hypothesis Time-traveler UFO hypothesis Interdimensional hypothesis Psychosocial hypothesis Extraterrestrial
Narrative of the abduction phenomenon
Narrative_of_the_abduction_phenomenon
redirect targets Cryptoterrestrial hypothesis – Suggestion of an alien civilization on Earth Extraterrestrial hypothesis – Hypothesis that some unidentified
Identification studies of UFOs
Identification_studies_of_UFOs
Debunked conspiracy theory about alleged child sex ring
abduction Area 51 Black Knight satellite Cryptoterrestrial / Extraterrestrial / Interdimensional hypothesis Dulce Base Estimate of the Situation (1948)
Pizzagate_conspiracy_theory
American journalist and UFOlogist (1930–2009)
extraterrestrial visitation hypothesis. However, after a year of investigations, Keel concluded that the extraterrestrial hypothesis was untenable. Indeed,
John_Keel
1985 in the scholarly journal Deviant Behavior, the "cultural rejection" hypothesis is a common psychological framework used to explain UFO belief, and posits
Psychological perspectives on UFO claims
Psychological_perspectives_on_UFO_claims
French computer scientist and ufologist (born 1939)
scientific legitimacy of the extraterrestrial hypothesis and later for promoting the interdimensional hypothesis. Vallée was born in Pontoise, France in 1939
Jacques_Vallée
Views on claims that aliens capture people
require a reevaluation of our concept of the nature of reality. This is the hypothesis that alien abduction is a literal phenomenon, in which extraterrestrial
Perspectives on the alien abduction phenomenon
Perspectives_on_the_alien_abduction_phenomenon
Study of UFOs
Little green men Psychosocial hypothesis Interdimensional hypothesis Time-traveler hypothesis Cryptoterrestrial UFO hypothesis Fringe science List of topics
Ufology
American academic and early researcher of ufology and parapsychology
parapsychology, best known for proposing an early version of the interdimensional hypothesis to explain flying saucer sightings. Layne was born in Viroqua, Wisconsin
Meade_Layne
Measure of a civilization's evolution
advanced civilizations; this scenario, which he calls the "Urbanization Hypothesis", would result in the regrouping and unification of several civilizations
Kardashev_scale
Conspiracy theory about contrails
abduction Area 51 Black Knight satellite Cryptoterrestrial / Extraterrestrial / Interdimensional hypothesis Dulce Base Estimate of the Situation (1948)
Chemtrail_conspiracy_theory
Apparent unusual observation in the sky
inexperience or misperception. Astronomer Andrew Fraknoi rejected the hypothesis that UFOs are extraterrestrial spacecraft and responded to the "onslaught
Unidentified_flying_object
Range of new religious beliefs and practices
have linked this holistic interpretation of the universe to the Gaia hypothesis of James Lovelock. The idea of holistic divinity results in a common New
New_Age
New Zealand UFO writer (1925–2016)
he did not originate the hypothesis, and he described John Philip Bessor as the "grand-daddy" of the "space critter" hypothesis. In 1991 Constable worked
Trevor_James_Constable
Author and ufologist
July 17, 2009) was a ufologist and proponent of the extraterrestrial hypothesis to explain UFO sightings. A member of the Authors Guild, he also wrote
Richard_H._Hall
Scholarly journal article
weapons may attract UAP [UFOs]". Of the two, the authors claim the first hypothesis is unlikely. Both papers were published in October 2025. "Transients in
Aligned, Multiple-transient Events in the First Palomar Sky Survey
Aligned,_Multiple-transient_Events_in_the_First_Palomar_Sky_Survey
Unidentified phenomenon at Hessdalen valley in Norway
Norwegian press proclaiming that "The Mystery in Hessdalen is Solved". One hypothesis put forward in 2010 suggests that the lights are formed by a cluster of
Hessdalen_lights
New Zealand writer and psychic medium
abduction Area 51 Black Knight satellite Cryptoterrestrial / Extraterrestrial / Interdimensional hypothesis Dulce Base Estimate of the Situation (1948)
Jeanette_Wilson
Conspiracy theory of reptilian humanoids
service (link) Lewis, Tyson; Richard Kahn (Winter 2005). "The Reptoid Hypothesis: Utopian and Dystopian Representational Motifs in David Icke's Alien Conspiracy
Reptilian_conspiracy_theory
American ufologist (1934–2019)
civilian to document the site of the Roswell UFO incident, and supported the hypothesis that it was a genuine crash of an extraterrestrial spacecraft. In 1968
Stanton_T._Friedman
American meteorologist and ufologist (1920-1971)
in support of expanding UFO studies, and promoted the extraterrestrial hypothesis as a plausible explanation of UFO phenomena. McDonald was born and raised
James_E._McDonald
Subjective experience of victimization by extraterrestrials
in International Journal of Dream Research, researchers focused on the hypothesis that if some of alien abduction stories are the products of REM sleep
Alien_abduction
List of alleged UFO sightings
seen them, and there was extensive discussion at that time. A common hypothesis was that it was a NATO missile. An eyewitness from Tirana recounted an
UFO_sightings_in_Albania
1989–1990 sightings of triangular UFOs
than by physicists. In The Belgian UFO Wave of 1989–1992 – A Neglected Hypothesis, Renaud Leclet et al. discussed the fact that some sightings could be
Belgian_UFO_wave
events have been deliberately distorted. These include the phantom time hypothesis of German conspiracy theorist Heribert Illig, who in 1991 published an
List_of_conspiracy_theories
American writer and UFO researcher (1897–1988)
expressed approval for Keyhoe's arguments in favor of the extraterrestrial hypothesis.[citation needed] Carl Jung argued that Keyhoe's first two books were
Donald_Keyhoe
Former U.S. military intelligence officer's claims about "non-human" spacecraft recovery
pathology professor and longtime proponent of the UFO extraterrestrial hypothesis, among others. (According to Leslie Kean, Nolan knows and respects Grusch
David Grusch UFO whistleblower claims
David_Grusch_UFO_whistleblower_claims
American magazine dedicated to UFOs, extraterrestrials, and paranormal phenomenon
the subject of unidentified flying objects (UFOs), the extraterrestrial hypothesis (ETH), as well as paranormal and Fortean subjects in general. UFO Magazine
UFO_Magazine
American astronomer and ufologist (1910–1986)
We must not ask, Hynek said, simply which hypothesis can explain the most facts, but rather which hypothesis can explain the most puzzling facts. Regarding
J._Allen_Hynek
1984 alleged UFO sighting in New York and Connecticut
Force's Project Blue Book, who later in life favored the interdimensional hypothesis explanation of UFOs, described the incident as "absolutely weird. There's
1984 Hudson Valley UFO sightings
1984_Hudson_Valley_UFO_sightings
1966 US UFO sightings
inspired by Hynek's life dramatized a public rejection of his swamp gas hypothesis. Lara Zielin, editorial director of University of Michigan's Bentley Historical
Michigan "swamp gas" UFO reports
Michigan_"swamp_gas"_UFO_reports
Interdimensional hypothesis – The proposal that UFO sightings are the result of experiences with another dimension. Psychosocial hypothesis – The proposal
List of reported UFO sightings
List_of_reported_UFO_sightings
Purported UFO incident in Brazil in 1996
the reported being. Further, he concluded that this strengthened the hypothesis that "this citizen, probably being dirty, due to the heavy rains and seen
Varginha_UFO_incident
Killing and mutilation of cattle under unusual and anomalous circumstances
the deviant hypothesis is the hypothesis that cattle mutilations are the result of cult activity. However, contrary to the deviancy hypothesis, which holds
Cattle_mutilation
decided to investigate the flying saucer reports that the extraterrestrial hypothesis was recognized at an official level". During 1947 the Air Force collected
Investigation of UFO reports by the United States government
Investigation_of_UFO_reports_by_the_United_States_government
American author, lecturer, and alleged UFO contactee
Angelucci, can be seen as one of the founding of the PSH. (Psychosocial hypothesis) Lewis, James R., editor, UFOs and Popular Culture, Santa Barbara, CA:
Orfeo_Angelucci
Purported organization that appears in UFO conspiracy theories
International UFO Symposium Proceedings - An Estimate of the Situation: The ET Hypothesis. Denver, Colorado: Mutual UFO Network. p. 97: In a letter to the late
Majestic_12
Alleged alien abduction, 1975
the Walton incident was a hoax. Starting in 2021, Sheaffer promoted the hypothesis that Rogers and the Waltons made use of a nearby fire lookout tower to
Travis_Walton_incident
British government study of UFOs (1997–2000)
subject to peer review, and it has been suggested that the "buoyant plasma" hypothesis would not have withstood independent scrutiny. Simpson, Mark (2006-05-07)
Project_Condign
American historian and ufologist
awake and conscious, and that therefore sleep paralysis is not a tenable hypothesis. Moreover, he has stated that her book was factually incorrect. Jacobs
David_M._Jacobs
Opposition to psychiatric diagnoses
abduction Area 51 Black Knight satellite Cryptoterrestrial / Extraterrestrial / Interdimensional hypothesis Dulce Base Estimate of the Situation (1948)
Mental_illness_denial
Alleged alien abduction in 1961
abodes for life. Results such as these led Fish herself to reject her hypothesis in a public statement. The 1966 publication of Interrupted Journey, by
Barney and Betty Hill incident
Barney_and_Betty_Hill_incident
USAF investigation of UFOs (1949–1951)
military and the U.S. government trying to discredit the extraterrestrial hypothesis". Both Hynek and Ruppelt claimed that Project Grudge was "as far from
Project_Grudge
U.S. Air Force study of UFOs (1952–1969)
were likely extraterrestrial in origin. (See also Extraterrestrial UFO hypothesis.) This was subsequently rejected by Gen. Hoyt Vandenberg, U.S. Air Force
Project_Blue_Book
the United States. Promoted the extraterrestrial hypothesis and later the interdimensional hypothesis. J. Salatun, (1927–2012), pioneer of UFO research
List_of_ufologists
Purported disk-shaped aircraft
to believe it's of an extra-terrestrial origin". This extraterrestrial hypothesis was accompanied by other unusual theories. Meade Layne speculated that
Flying_saucer
Conspiracy theory alleging child grooming by LGBTQ people
abduction Area 51 Black Knight satellite Cryptoterrestrial / Extraterrestrial / Interdimensional hypothesis Dulce Base Estimate of the Situation (1948)
LGBTQ grooming conspiracy theory
LGBTQ_grooming_conspiracy_theory
was to further the scholarly research of UFOs and the extraterrestrial hypothesis (ETH), and to secure the release of alleged classified U.S. government
Fund_for_UFO_Research
University of Colorado UFO Project
embraced diverse approaches, especially with respect to the extraterrestrial hypothesis (ETH). In late January 1967, Condon stated in a lecture that he thought
Condon_Committee
Supposed disastrous doomsday scenario
through to the 1990s when the astronomer Robert Harrington put forward his hypothesis for an extra planet beyond Neptune with, as one example, a semi-major
Nibiru_cataclysm
UFOs reported by astronauts while in space
later, Carlotto proposed a less exotic, ostensibly meteorologically based hypothesis, suggesting the F1 Event could "represent the first observation of a new
UFO_sightings_in_outer_space
2021 report from the Office of the Director of National Intelligence
of course, is intended to mean 'aliens,' even if enthusiasts for that hypothesis will not explicitly say so. This cultivates credulous media attention
UFO Report (U.S. Intelligence)
UFO_Report_(U.S._Intelligence)
School of early Jewish mysticism
Written' as the Vocation of Conceiving Jewishly" (McGinley, J W; 2006) the hypothesis is offered and defended that "Rabbi Ishmael ben Elisha" (more often, simply
Merkabah_mysticism
U.S. Capital flying saucer incidents on consecutive weekends
magazine, would also argue in favor of the temperature inversion/mirage hypothesis. In 2002 Klass told a reporter that "radar technology in 1952 wasn't sophisticated
1952 Washington, D.C., UFO incident
1952_Washington,_D.C.,_UFO_incident
UFO researcher (1919–2005)
most or all UFOs, even cases of alleged alien abduction. Klass's plasma hypothesis was not well received by those on either side of the UFO debate, who noted
Philip_J._Klass
American UFO researcher (1900–1959)
in ufological circles as "probably the most original extraterrestrial hypothesiser of the 1950s", and it has been said of him that he was "educated in astronomy
Morris_K._Jessup
Alleged 1978 alien abduction in Italy
also demonstrated that the supposed evidence for the extraterrestrial hypothesis had logical or natural explanations, which were omitted or manipulated
Zanfretta_UFO_Incident
Wave of UFO sightings in the US in 1896/97
fall into the realm of mythology. In 1896 and 1897, the extraterrestrial hypothesis was suggested by some newspapers to account for the appearance of the
Mystery_airship
Hypothetical form of archaeology of remnants of alien civilizations
spinoff Stargate Atlantis Ancient astronauts Pseudoarchaeology Silurian hypothesis Xenolinguistics Freitas, Robert. "Naming Extraterrestrial Life"., retrieved
Xenoarchaeology
Soviet mathematician (1920–1988)
Tunguska event. Felix Ziegel was the first in the USSR to come with the hypothesis for Tunguska blast having been the result of an alien spacecraft crash
Felix_Ziegel
Belief that HIV does not cause AIDS
research proposals by both supporters and denialists of the HIV/AIDS hypothesis. South African health official Khotso Mokhele praised both proposals,
HIV/AIDS denialism in South Africa
HIV/AIDS_denialism_in_South_Africa
Series of disputed celestial events (1977)
"'Flashes' in the Atmosphere" by M. Dmitriyev, where a chemiluminescence hypothesis was put forward. According to Dmitriyev, the phenomenon was "neither the
Petrozavodsk_phenomenon
1953 scientific committee for UAP reports
of terrestrial (either American or Russian) manufacture, favouring the hypothesis that currently unidentified reports were misidentifications of conventional
Robertson_Panel
Reports of unidentified flying objects in 1947
writings named John Philip Bessor became the first modern proponent of the hypothesis when he authored a letter to the Air Force suggesting that discs might
1947_flying_disc_craze
1950 UFO sighting
that "past investigations have left airplanes as the principal working hypothesis. The data at hand indicate that while it strains credibility to suppose
Mariana_UFO_film
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CRYPTOTERRESTRIAL HYPOTHESIS
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CRYPTOTERRESTRIAL HYPOTHESIS
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CRYPTOTERRESTRIAL HYPOTHESIS
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CRYPTOTERRESTRIAL HYPOTHESIS
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CRYPTOTERRESTRIAL HYPOTHESIS
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