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11 Facts About Unidentified Flying Object

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An unidentified flying object, or UFO, in its most general definition, is any apparent anomaly in the sky that is not identifiable as a known object or phenomenon.

An omen is a phenomenon that is believed to foretell the future, often signifying the advent of change.

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Culturally, UFOs are associated with claims of visitation by extraterrestrial life or government-related conspiracy theories, and have become popular subjects in fiction.

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UFOs are often identified after their sighting.

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Sometimes, however, UFOs cannot be identified because of the low quality of evidence related to their sightings.

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Stories of fantastical celestial apparitions have been told since antiquity, but the term "UFO" was officially created in 1953 by the United States Air Force to serve as a catch-all for all such reports.

The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the seven American uniformed services.

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In its initial definition, the USAF stated that a "UFOB" was "any airborne object which by performance, aerodynamic characteristics, or unusual features, does not conform to any presently known aircraft or missile type, or which cannot be positively identified as a familiar object."

In modern usage, a missile is a self-propelled precision-guided munition system, as opposed to an unguided self-propelled munition, referred to as a rocket.

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Accordingly, the term was initially restricted to that fraction of cases which remained unidentified after investigation, as the USAF was interested in potential national security reasons and/or "technical aspects".

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During the late 1940s and through the 1950s, UFOs were often referred to popularly as "flying saucers" or "flying discs".

A flying saucer is a descriptive term for a supposed type of flying craft having a disc or saucer-shaped body, commonly used generically to refer to an anomalous flying object.

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The term UFO became more widespread during the 1950s, at first in technical literature, but later in popular use.

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UFOs garnered considerable interest during the Cold War, an era associated with a heightened concern for national security.

The Cold War was a state of political and military tension after World War II between powers in the Western Bloc and powers in the Eastern Bloc.

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Various studies have concluded that the phenomenon does not represent a threat to national security nor does it contain anything worthy of scientific pursuit.

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