Unidentified flying object

A UFO (Unidentified Flying Object) is an object in the sky which cannot be identified.

 Identified flying objects (IFOs) 
Studies estimate that 50-90% of all reported UFO sightings are identified later. Most are natural or man-made objects that looked strange. 80-90% of UFOs are identified as one of three things: 
 astronomical causes (for example: planets, stars, or meteors)
 aircraft
 balloons (including weather balloons)

 New term 
Since the 2020s, people have come up with the following terminology:
Unidentified Aerial Phenomena
Unidentified Anomalous Phenomena
Therefore, it is common to hear "UFO" and "UAP" while listening to people talk about this topic.

 References 
 Allan Hendry, The UFO Handbook: A Guide to Investigating, Evaluating, and Reporting UFO Sightings, 1979, Doubleday & Co., 

 Other websites 
 Wikinews - UFO Archive
 CIA educational summary on UFO  (working link or what? Maybe it should be used this link  instead?)
 NASA Institute for Advanced Concepts
 BBC article on Mexican Air-force videotape
 NASA UFO Hacker Video Interview 
 Popularmechanics Article - When UFOs Arrive: February 2004 Cover Story 
References

Category:Pseudoscience
Category:Atmospheric optical phenomena