Book Cover of Unidentified Flying Objects

Unidentified Flying Objects

by United States Federal Bureau of Investigation (FBI)

An unidentified flying object (UFO) is any perceived aerial phenomenon that cannot immediately be identified or explained. Most UFOs are identified or investigated as conventional objects or phenomena. The phrase was coined as an acronym by Project Blue Book project head Edward J. Ruppelt, but today UFO is widely used as a stand-in for extraterrestrial spacecraft-aircraft that people claim to have observed. Many UFOs are described as being flying saucers, as is shown in the image to the right.

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Language

English

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English

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United States Federal Bureau of Investigation (FBI) image

The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States and its principal federal law enforcement agency. Op...

Books by United States Federal Bureau of Investigation (FBI)

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