http://en.wikipedia.org/wiki/UFO_sightingUFO:
Unidentified flying object (commonly abbreviated UFO) is a term used to refer to any aerial phenomenon whose cause can not be easily or immediately determined.
How IT All Started:
The first reports and official investigations of UFOs began during World War II with sightings of so-called foo fighters by Allied airplane crews, and with widespread sightings of European "ghost rockets" in 1946. UFO reports became more common after the first widely publicized US sighting - reported by private pilot Kenneth Arnold in 1947 - which gave rise to the popular terms "flying saucer" and "flying disc". Since then, millions of people believe that they have seen UFOs, and tens of thousands of such reports have been catalogued.
To account for unsolved UFO cases, several hypotheses have been proposed.
- The Extraterrestrial hypothesis (ETH), defined by Edward U. Condon in the 1968 Condon Report as "The idea that some UFOs may be spacecraft sent to Earth from another civilization, or on a planet associated with a more distant star", further attributing the popularity of the idea to Donald Keyhoe's UFO book from 1950, though the idea clearly predated Keyhoe, appearing in newspapers and various government documents (see immediately below). This is probably the most popular theory among Ufologists.
- The Interdimensional hypothesis, that UFOs are objects crossing over from other dimensions or parallel universe, popularly proposed by Jacques Vallée, though also predating him.
- The Paranormal/Occult Hypothesis; A variant of the Interdimensional Hypothesis, invoked to explain so-called paranormal aspects sometimes associated with UFO reports
- That UFOs are time machines or vehicles from a future Earth, perhaps made by our descendants.
- The Psychosocial Hypothesis, that what people report as UFO experiences is the result of psychological misperception mechanisms and is strongly influenced by popular culture.
- That UFOs represent poorly understood or still unknown natural phenomena, such as ball lightning or sprites.
- The Earthquake lights/Tectonic Strain hypothesis: UFOs are caused by strains in Earth's crust near earthquake faults, which can also supposedly induce hallucinations.
- That UFOs are military flying saucers; top secret or experimental aircraft unfamiliar to most people.
Bibliography
- http://images.google.com/imgres?imgurl=http://www.babble.com/CS/blogs/strollerderby/ufo05.jpg&imgrefurl=http://www.babble.com/CS/blogs/strollerderby/archive/tags/jimmy%2Bcarter/default.aspx&usg=__ch1gAKC4MXWnl-6jyRsnXF3WPuo=&h=400&w=512&sz=23&hl=en&start=9&sig2=HEQW5SrwiBtbVPIb43M_fQ&um=1&tbnid=kV7UpEHuh9mCzM:&tbnh=102&tbnw=131&ei=a5-sSdeMA9mitgfhhuDnBA&prev=/images%3Fq%3DUFO%26um%3D1%26hl%3Den%26rlz%3D1C1GGLS_en-USUS295US304%26sa%3DN
- http://en.wikipedia.org/wiki/Unidentified_flying_object
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