Postingan
An unidentified flying object, or UFO, is any object in the air or upper atmosphere that cannot be identified. Some definitions, such as that which is used by the USAF, define a UFO as an object unable to be identified after scrutiny, while other definitions define an object as being a UFO from the time it is first reported as being unidentified, even though most subsequently become IFOs, Identified Flying Objects.
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