UFO enthusiasts have described the phenomenon as an aerial battle of extraterrestrial origin. The 1561 celestial phenomenon over Nuremberg as printed in an illustrated news notice. History Early history before the 20th century 4.2.1 Claims by military, government, and aviation personnel.
3.2.5.1 White House statement of November 2011. 3.2.5 FOIA release of documents in 1978. 3.2.4.2 USAAF and FBI response to the 1947 sightings. 1.1 Early history before the 20th century. The 20th century saw studies and investigations into UFO reports conducted by governments (such as Projects Grudge and Sign 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 did not achieve their current cultural prominence until the period after World War II, escalating during the Space Age. Small but vocal groups of " ufologists" favour unconventional, pseudoscientific hypotheses, some of which go beyond the typical extraterrestrial visitation claims and sometimes form part of new religions. 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. On investigation, most UFOs are identified as known objects or atmospheric phenomena, while a small number remain unexplained. Photograph of a purported UFO in Passaic, New Jersey, taken on July 31, 1952Īn unidentified flying object ( UFO), also called a UAP ( unidentified aerial phenomenon), is any perceived aerial phenomenon that cannot be immediately identified or explained. Nation of Islam#The Mother Plane and Ezekiel's Wheel. Unidentified Aerial Phenomena Task Force - USA. 
Advanced Aerospace Threat Identification Program - USA.
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