UNIDENTIFIED FLYING OBJECT

A term originally coined by the military, an unidentified flying object (usually abbreviated toUFO or U.F.O.) is an unusual apparent anomaly in the sky that is not readily identifiable to the observer as any known object. While a small percentage remain unexplained, the majority of UFO sightings are often later identified as any number of various natural phenomenon or man-made objects.^{[citation needed]}

CONTENTS    [hide]  1 Extraterrestrial hypothesis 2 Official White House Position 3 Studies 4 Terminology 5 Early history 5.1 The Kenneth Arnold sightings 6 Investigations 6.1 Project Sign 6.2 Project Magnet 6.3 Project Grudge 6.4 USAF Regulation 200-2 6.5 Project Bluebook 6.6 Scientific studies 6.7 United States 6.7.1 After 1947 sightings 6.7.2 Project Sign 6.7.3 Condon Committee 6.7.4 Notable cases 6.8 Canada 6.9 France 6.10 United Kingdom 6.10.1 Notable cases 6.11 Uruguay 6.12 Astronomer reports 7 Identification of UFOs 7.1 UFO hypotheses 8 Associated claims 8.1 Reverse engineering 9 Ufology 9.1 Researchers 9.2 Sightings 9.3 Organizations 9.4 Categorization 9.5 Scientific skepticism 10 Conspiracy theories 10.1 Allegations of evidence suppression 11 Famous hoaxes 12 In popular culture 13 See also 13.1 General 13.2 Skepticism 13.3 Psychology 13.4 Histories 13.5 Technology 14 External links 15 References