Alien Visitation (other)
Alien visitation is the idea that intelligent extraterrestrial beings have visited Earth. Claimed forms of such visitations include; * Alien abduction, kidnapping by aliens * Ancient astronaut, alien influence of major historical events * Close encounter, observation of alien vessels * Contactee 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. As a cultural phenomenon, c ...

Extraterrestrial Life
Extraterrestrial life, colloquially referred to as alien life, is life that may occur outside Earth and which did not originate on Earth. No extraterrestrial life has yet been conclusively detected, although efforts are underway. Such life might range from simple forms like prokaryotes to intelligent beings, possibly bringing forth civilizations that might be far more advanced than humankind. The Drake equation speculates about the existence of sapient life elsewhere in the universe. The science of extraterrestrial life is known as astrobiology. Speculation about the possibility of inhabited "worlds" outside the planet Earth dates back to antiquity. Multiple early Christian writers discussed the idea of a "plurality of worlds" as proposed by earlier thinkers such as Democritus; Augustine references Epicurus's idea of innumerable worlds "throughout the boundless immensity of space" (originally expressed in his Letter to Herodotus) in ''The City of God''. In his first century p ...
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Alien Abduction
Alien abduction (also called abduction phenomenon, alien abduction syndrome, or UFO abduction) refers to the phenomenon of people reporting their experience of being kidnapped by extraterrestrial beings and subjected to physical and psychological experimentation. People claiming to have been abducted are usually called "abductees" or "experiencers". Most scientists and mental health professionals explain these experiences by factors such as suggestibility (e.g. false memory syndrome), sleep paralysis, deception, and psychopathology.Appelle, 1996 Skeptic Robert Sheaffer sees similarity between some of the aliens described by abductees and those depicted in science fiction films, in particular '' Invaders From Mars'' (1953). Typical claims involve forced medical examinations that emphasize the subject's reproductive systems.Miller, John G. "Medical Procedural Differences: Alien Versus Human." In: Pritchard, Andrea & Pritchard, David E. & Mack, John E. & Kasey, Pam & Yapp, Claudia. ...
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Ancient Astronaut
Ancient astronauts (or ancient aliens) refers to a pseudoscientific hypothesis which holds that intelligent extraterrestrial beings visited Earth and made contact with humans in antiquity and prehistoric times. Proponents suggest that this contact influenced the development of modern cultures, technologies, religions, and human biology. A common position is that deities from most, if not all, religions are extraterrestrial in origin, and that advanced technologies brought to Earth by ancient astronauts were interpreted as evidence of divine status by early humans. The idea that ancient astronauts existed and visited Earth is not taken seriously by academics and archaeologists, who consider it to be pseudoarchaeological and/or unscientific. It has received no credible attention in peer reviewed studies. When proponents of the idea present evidence in favor of their beliefs, it is often distorted or fabricated. Well-known ancient astronauts proponents in the latter half of ...
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Close Encounter
In ufology, a close encounter is an event in which a person witnesses an unidentified flying object. This terminology and the system of classification behind it were first suggested in astronomer and UFO researcher J. Allen Hynek's 1972 book ''The UFO Experience: A Scientific Inquiry''. 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. Sightings more than from the witness are classified as "Daylight Discs," "Nocturnal Lights," or "Radar/Visual Reports." Sightings within about are subclassified as various types of "close encounters." Hynek and others argued that a claimed close encounter must occur within about to greatly reduce or eliminate the possibility of misidentifying conventional aircraft or other known phenomena. Hynek's scale became well known after being referenced in a 1977 film, ''Close Encounters of the Third Kind'', which ...
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