The 20th century saw studies and investigations into UFO reports conducted by governments (such as Project Blue Book in the United States and Project Condign in the United Kingdom), as well as by organisations and individuals. While unusual sightings have been reported in the sky throughout history, UFOs became culturally prominent after World War II, escalating during the Space Age. Beliefs surrounding UFOs have inspired parts of new religions.

Small but vocal groups of ufologists favour unconventional or pseudoscientific hypotheses, often claiming that UFOs are evidence of extraterrestrial intelligence, technologically advanced cryptids or interdimensional contact. Scientists and skeptic organizations such as the Committee for Skeptical Inquiry have provided prosaic explanations for a large number of claimed UFOs being caused by natural phenomena, human technology, delusions, or hoaxes.

government currently has two entities dedicated to UAP (or UFO) data collection and analysis: NASA's UAP independent study team and the All-domain Anomaly Resolution Office. Upon investigation, most UFOs are identified as known objects or atmospheric phenomena, while a small number remain unexplained.

Fourth International Posadist - ArgentinaĪ photograph of a purported UFO in Passaic, New Jersey, taken on July 31, 1952Īn unidentified flying object ( UFO), or unexplained anomalous phenomenon ( UAP), is any perceived aerial phenomenon that cannot be immediately identified or explained.

Unidentified Aerial Phenomena Task Force - US.Advanced Aerospace Threat Identification Program - US.

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