PowerPoint Presentation: U.F.O Made by : Nikhil Introduction: Introduction An unidentified flying object, often abbreviated UFO or U.F.O., is an unusual apparent anomaly in the sky that is not readily identifiable to the observer as any known object, often associated with extraterrestrial life. Terminology : Terminology The Oxford English Dictionary defines a UFO as "An unidentified flying object; a ‘flying saucer’." The word was first used in print by Donald Keyhoe in 1953 . The acronym "UFO" was coined by Capt. Edward J. Ruppelt The phrase "flying saucer" had gained widespread attention after the summer of 1947 . In popular usage the term UFO came to sometimes be used to refer to alien spacecraft. PowerPoint Presentation: Study UFOs have become a relevant theme in modern culture, and the social phenomena have been the subject of academic research in sociology and psychology. Studies have established that the majority of UFO observations are misidentified conventional objects or natural phenomena—most commonly aircraft, balloons, noctilucent clouds,nacreous clouds , or astronomical objects such as meteors or bright planets with a small percentage even being hoaxes. While UFOs have been the subject of extensive investigation by various gover nmen ts and although some scientists support the extraterrestrial hypot hesis, few scientific papers about UFOs have been published in peer-reviewed journals. PowerPoint Presentation: Identification & Projects UFOs have been subject to investigations over the years that varied widely in scope and scientific rigor. Governments or independent academics in the various countrie like United States, Canada, the United Kingdom, Japan, the Soviet Union and so on are known to have investigated UFO reports at various times.Among the best known government studies are the ghost rockets investigation by the Swedish military (1946–1947), Project Blue Book, previously Project Sign and Project Grudge conducted by the United States Air Force from 1947 until 1969, the secret U.S. Army/Air Force Project Twinkle investigation into green fireballs (1948–1951), the secret USAF Project Blue Book Special Report # 14 by the Battelle Memorial Institute, and Brazilian Air Force Operation Saucer (1977). France has had an ongoing investigation (GEPAN/SEPRA/GEIPAN) within its space agency CNES since 1977; the government of Uruguay has had a similar investigation since 1989. PowerPoint Presentation: Identification of UFOs Studies show that after careful investigation, the majority of UFOs can be identified as ordinary objects or phenomena .The most commonly found identified sources of UFO reports are: Astronomical objects (bright stars, planets, meteors, re-entering man-made spacecraft, artificial satellites, and the moon) Aircraft (Aerial advertising & aircraft, missile launches) Balloons (weather balloons, large research balloons) Other atmospheric objects and phenomena (birds, unusual clouds , kites, flares) Light phenomena (mirages, Fata Morgana , moon dogs, searchlights and other ground lights, etc.) Mainly Hoaxes PowerPoint Presentation: 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 PowerPoint Presentation: In popular culture UFOs constitute a widespread international cultural phenomenon of the last 60 years. Gallup polls rank UFOs near the top of lists for subjects of widespread recognition. A 1996 Gallup poll reported that 71 percent of the United States population believed that the government was covering up information regarding UFOs. A 2002 Roper poll for the Sci Fi Channel found similar results, but with more people believing that UFOs are extraterrestrial craft . In that latest poll, 56 percent thought UFOs were real craft and 48 percent that aliens had visited the Earth. Again, about 70 percent felt the government was not sharing everything it knew about UFOs or extraterrestrial life Another effect of the flying saucer type of UFO sightings has been Earth-made flying saucer craft in space fiction, for example the Earth spacecraft Starship C-57D in Forbidden Planet , the Jupiter Two in Lost in Space , and the saucer section of the USS Enterprise in Star Trek , and many others .