An unidentified flying object (UFO), or unidentified anomalous phenomenon (UAP), is any perceived airborne, submerged or transmedium phenomenon that cannot be immediately identified or explained. Upon investigation, most UFOs are identified as known objects or atmospheric phenomena, while a small number remain unexplained.
UFO conspiracy theories are a subset of conspiracy theories which argue that various governments and politicians globally, in particular the United States government, are suppressing evidence that unidentified flying objects are controlled by a non-human intelligence or built using alien technology. Such conspiracy theories usually argue that Earth governments are in communication or cooperation with extraterrestrial visitors despite public disclaimers, and further that some of these theories claim that the governments are explicitly allowing alien abduction.
In ufology, a close encounter is an event in which a person witnesses an unidentified flying object (UFO) at relatively close range, where the possibility of mis-identification is presumably greatly reduced. This terminology and the system of classification behind it were first suggested in astronomer and UFO researcher J. Allen Hynek's book The UFO Experience: A Scientific Inquiry (1972). Categories beyond Hynek's original three have been added by others but have not gained universal acceptance, mainly because they lack the scientific rigor that Hynek aimed to bring to ufology.
Ufology, sometimes written UFOlogy, is the investigation of unidentified flying objects (UFOs) by people who believe that they may be of extraordinary origins. While there are instances of government, private, and fringe science investigations of UFOs, ufology is generally regarded by skeptics and science educators as an example of pseudoscience.
The Varginha UFO incident involves a series of events in 1996 when residents of Varginha, Brazil, claimed seeing one or more strange creatures and at least one unidentified flying object (UFO). The reports garnered extensive media coverage. Other associated claims include the capture of one or more extraterrestrial beings by the Brazilian authorities, animal fatalities at a zoo, and a woman impregnated by an extraterrestrial. An investigation by the Brazilian Army concluded that a city resident was mistaken for an alien creature and the movement of military personnel in the region was routine.
In ufology, the psychosocial hypothesis, abbreviated PSH, argues that at least some UFO reports are best explained by psychological or social means. It is often contrasted with the better-known extraterrestrial hypothesis (ETH), and is particularly popular among UFO researchers in the United Kingdom, such as David Clarke, Hilary Evans, the editors of Magonia magazine, and many of the contributors to Fortean Times magazine. It has also been popular in France since the publication in 1977 of a book written by Michel Monnerie, Et si les ovnis n'existaient pas?.
Josef Allen Hynek was an American astronomer, professor, and ufologist. He is perhaps best remembered for his UFO research. Hynek acted as scientific advisor to UFO studies undertaken by the U.S. Air Force under three projects: Project Sign (1947–1949), Project Grudge (1949–1951) and Project Blue Book (1952–1969).
Jacques Fabrice Vallée is an Internet pioneer, computer scientist, venture capitalist, author, ufologist and astronomer currently residing in San Francisco, California and Paris, France.
Contactees are persons who claim to have experienced contact with extraterrestrials. Some claimed ongoing encounters, while others claimed to have had as few as a single encounter. Evidence is anecdotal in all cases.
Steven Macon Greer is an American ufologist and a retired physician. He founded the Center for the Study of Extraterrestrial Intelligence (CSETI) and the Disclosure Project, which seeks the disclosure of alleged classified UFO information.
Linda Moulton Howe is an American investigative journalist and Regional Emmy award-winning documentary film maker best known for her work as a ufologist and advocate of a variety of conspiracy theories, including her investigation of cattle mutilations and conclusion that they are performed by extraterrestrials. She is also noted for her speculations that the U.S. government is working with aliens.
GEIPAN, is a unit of the French Space Agency CNES based in Toulouse whose brief is to investigate unidentified aerospace phenomena (UAP), and make its findings available to the public.
Heaven's Gate was an American new religious movement known primarily for the mass suicides committed by its members in 1997. Commonly designated a cult, it was founded in 1974 and led by Marshall Applewhite (1931–1997) and Bonnie Nettles (1927–1985), known within the movement as Do and Ti. Nettles and Applewhite first met in 1972 and went on a journey of spiritual discovery, identifying themselves as the two witnesses of Revelation, attracting a following of several hundred people in the mid-1970s. In 1976, a core group of a few dozen members stopped recruiting and instituted a monastic lifestyle.
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 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 explained as psychological or social phenomenon.
Mac Tonnies was an American author and blogger whose work focused on futurology, transhumanism and paranormal topics.
UFOs: Past, Present, and Future is a 1974 documentary film that examines several prominent UFO sightings from the post-war to contemporary era. It was re-released in 1976 and 1979 under the title UFOs: It Has Begun to coincide with renewed interest in the subject due to the release of Steven Spielberg's Close Encounters of the Third Kind. It is based on the book UFOs: Past, Present, and Future by Robert Emenegger.
The Phenomenon is a 2020 documentary film written and produced by ufologist James Fox.
The Calvine UFO was a reported sighting of an unidentified flying object (UFO) near the hamlet of Calvine in Perthshire, Scotland in August 1990.
