What is Unidentified flying object?
[[File:Supposed UFO, Passaic, New Jersey.jpg|thumb|right|200px|A UFO in [[New Jersey]], USA]] [[File:UFO landing strip in Cachi, Argentina.jpg|thumb|right|200px|UFO landing strip in Cachi, Argentina]] A '''UFO''' ('''Unidentified Flying Object''') is any object flying in the sky which cannot be [[:wikt:identify|identified]] by the person who sees it. Sometimes the object is [[:wikt:investigate|investigated]]. If people can still not figure out what the object is after an investigation, it is called a UFO. If they figure out what the object is, it can no longer be called a UFO because it has been identified. [[File:Ufojakob.jpg|thumb|UFO, Jakobsdal, [[Linköping]], [[Sweden]]]] Even though UFOs might have different origins, people often use the word ''UFO'' when they are talking about [[extraterrestrial life|alien]] [[spacecraft]]. '''Flying saucer''' is another word that is often used to describe an unidentified flying object. Some UFOs that are seen in the water, or going in or out of the water are called USOs (Unidentified Submerged Objects). == Identified flying objects (IFOs) == Studies estimate that 50-90% of all reported UFO sightings are identified later. Usually 10-20% are never identified. Studies also show that very few UFO sightings are [[hoax]]es (people trying to trick other people). Most UFOs are actually natural or man-made objects that looked strange. 80-90% of IFOs are identified as one of three different things: # [[astronomy|astronomical]] causes (for example: [[planet]]s, [[star]]s, or [[meteor]]s) # [[aircraft]] # [[balloon]]s (including [[weather balloon]]s) 10-20% of IFOs are other causes (such as birds, clouds, [[wikt:mirage|mirages]], searchlights, etc.) == References == * [[Allan Hendry]], ''The UFO Handbook: A Guide to Investigating, Evaluating, and Reporting UFO Sightings'', 1979, Doubleday & Co., {{ISBN|0-385-14348-6}} == Other websites == * [http://en.wikinews.org/wiki/Category:UFO Wikinews - UFO Archive] * [https://www.cia.gov/csi/studies/97unclass/ufo.html CIA educational summ