Unidentified Flying Object - Extraterrestrial Hypothesis

Extraterrestrial Hypothesis

While technically a UFO refers to any unidentified flying object, in modern popular culture the term UFO has generally become synonymous with alien spacecraft; however, the term ETV (ExtraTerrestrial Vehicle) is sometimes used to separate this explanation of UFOs from totally earthbound explanations.

Proponents argue that because these objects appear to be technological and not natural phenomena and are alleged to display flight characteristics or have shapes seemingly unknown to conventional technology, the conclusion is that they must not be from Earth. Though UFO sightings have occurred throughout recorded history, modern interest in them dates from World War II (see foo fighter), further fueled in the late 1940s by Kenneth Arnold's report of a close encounter, which led to coining of the term flying saucer, and the Roswell UFO Incident. Since then governments have investigated UFO reports, often from a military perspective, and UFO researchers have investigated, written about, and created organizations devoted to the subject. One such investigation, the UK's Project Condign, made public in 2006, attributed unaccountable UFO sightings to a hitherto unknown and scientifically unexplained "plasma field." It also concluded that Russian, former Soviet Republics, and Chinese authorities had made a co-ordinated effort to understand the UFO phenomenon and that military organizations, particularly in Russia, had done "considerably more work (than is evident from open sources)" on military applications stemming from their UFO research. The report also noted that "several aircraft have been destroyed and at least four pilots have been killed 'chasing UFOs'."