Unidentified Flying Objects, UFOs have always been shrouded in mystery. Despite numerous sightings of flying saucers and alien beings reported around the world, the existence of UFOs has never been confirmed. So far, all kinds of debates exist, and all arguments, both for and against the existence of UFOs, will continue to perplex the public. There are many possible explanations as to why UFOs are still a mystery, some of which are discussed here. An unidentified flying object, UFO is “an object or light, reportedly seen in the sky, whose appearance, trajectory, and general dynamic and luminescent behavior do not immediately suggest a logical and conventional explanation” (UFO). According to the general belief, UFOs are spaceships, belonging to extraterrestrial life, or aliens. However, it is important to note that all unidentified objects in the sky do not necessarily belong to aliens. Many UFOs, mistaken for spaceships, have actually turned out to be balloons meteorological or military aircraft.There have been many cases, however, in which the appearance of a UFO cannot be explained on the basis of rational terrestrial phenomena, and it is believed that they may only be alien spaceships or flying saucers many cases of alien sightings on earth For example, it was reported that a farmer and two members of the Mutual UFO Network, MUFON, saw a three-foot tall alien in the southeastern United States (Keen). In another event that occurred some 69 years ago in Los Angeles during World War II, an apparent ... middle of paper ......behind the UFO sightings and the US Air Force.” usnews.com. US News Digital Weekly, September 16, 2010. Web. July 19, 2011. Linkhorn, Tyrel. “A UFO researcher wonders what LA was up to 69 years ago.” limaohio.com. Lima News Ohio, March 15, 2011. Web. July 19, 2011. Robbins, Jefferson. “Remote UFO center keeps tabs on NCW.” wenatcheeworld.com. The Wenatchee World, March 19, 2011. Web. July 19, 2011. “UFO.” encyclopedia2.thefreedictionary.com. Columbia Electronic Encyclopedia Free Online Dictionary, July 1, 2010. Web. July 19 2011