Unidentified flying object (commonly abbreviated as UFO or U.F.O.) is the popular term for any aerial phenomenon whose cause cannot be easily or immediately determined. Both military and civilian research show that a significant majority of UFO sightings have been identified after further investigation, either explicitly or indirectly through the presence of clear and simple explanatory factors (see Occam's Razor). The United States Air Force, which coined the term in 1952, initially defined UFOs as those objects that remain unidentified after scrutiny by expert investigators, though the term UFO is often used more generally to describe any sighting unidentifiable to the reporting observer(s). Popular culture frequently takes the term UFO as a synonym for alien spacecraft. Cults have become associated with UFOs, and mythology and folklore have evolved around the phenomenon. Some investigators now prefer to use the broader term unidentified aerial phenomenon (or UAP), to avoid the confusion and speculative associations that have become attached to UFO.

Studies have established that only a small percentage of reported UFOs are actual hoaxes, while the majority are observations of some real but conventional object—most commonly aircraft, balloons, or astronomical objects such as meteors or bright planets—that have been misidentified by the observer as anomalies. A small percentage of reported sightings (usually 5 %–20 %) are classified as unidentified flying objects in the strictest sense (see below for some studies).

Certain scientists have argued that all UFO sightings, in the strictest sense, are misidentifications of prosaic natural phenomena and historically, there was debate among some scientists about whether scientific investigation was warranted given available empirical data. Very little peer-reviewed literature has been published in which scientists have proposed, studied or supported non-prosaic explanations for UFOs.

UFO reports became frequent after the first widely publicized US sighting – reported by private pilot Kenneth Arnold in 1947 – that gave rise to the popular terms "flying saucer" and "flying disc". Since then, millions of people have reported that they have seen UFOs.

From Wikipedia under the GNU Free Documentation License
Thu Jun 11 12:15:50 2009

How can u tell the difference between ufos from under the sea, ufos from another planet, and ufos from USA?
Q. Who else uses flying saucers?
Asked by Squidbillie - Sat Dec 27 21:07:00 2008 - - 13 Answers - 0 Comments
Now that a former arizona governer claims the phoenix lights were ufos, what do you think?
Q. I just want to say Im not a believer, rather agnostic. Certainly there's ETs out thete, but can they travel here?
Asked by Ms Congeniality - Tue Nov 13 14:40:46 2007 - - 12 Answers - 0 Comments

A. If we don't know what they are, they're UFOs. I haven't heard what they might actually be. Obviously they're not ETs though.
Answered by water_skipper - Tue Nov 13 19:41:53 2007

Why would the authorities want to withhold information on UFOs?
Q. If it were true that the respective authorities are involved in the withholding of information concerning extra terrestrials, why do you think they want to do that? Could they not just acknowledge the existence of such things? Do you think they are really in possession of extra terrestrial technology? Thanks to all for the reply so far. But why would people panic? Isn't this the 21st century? Aren't the peoples in this world marture enough? Have the people in this world not seen enough of terrifying news in this world to take them within their stride? For example, back in the good old days, my grandmother will be horiffied to hear the news of mass murders or violent robberies. These things, however, my mother, who is now very old, just… [cont.]
Asked by StandTall - Sun Jul 2 12:40:03 2006 - - 6 Answers - 0 Comments

A. Why would the authorities want to withhold information on UFOs? The truth is: they can't. The idea that our authorities could keep something like this secret is ridiculous - they couldn't keep the Department of Homeland Security secret investigation into terrorist finances secret, they couldn't keep the atomic bomb secret from the Russians *during* World War II (Stalin knew about it before Truman told him), and they couldn't keep UFOs secret either. People don't keep secrets: to think that is a mis-understanding of human nature. The most you can do is delay the information. There is, however, a common 'archetype' that transcends cultures and languages - they all have a 'UFO' archetype (the UFO archetype is the symbol for the 'godhead' [cont.]
Answered by jimdempster - Sun Jul 2 16:37:39 2006

From Yahoo Answer Search: "UFOs"
Wed Jun 3 03:15:06 2009

See also:

  • AlienExistence.comAlienExistence.com
    alienexistence.com
    UK UFO resource running petition to uncover facts regarding UFO's and alien visitation.
  • UFO's Evidence?UFO's Evidence?
    users.erols.com
    UFO, Cydonia, opinion and link page for the serious researcher.
  • UFOs and the National Security StateUFOs and the National Security State
    keyholepublishing.com
    An Unclassified History. Volume One, 1941 to 1973. This is a thorough historical analysis of the national security dimensions of the UFO phenomenon.
Custom search only UFOs sites:

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Tue Jun 9 05:45:41 2009
EGYPTIAN PHARAOH FLEW ON UFO - Weekly World News (satire)
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egyptian pharaoh flew on ufo

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From Google News Search: "UFOs"
Fri Jun 26 16:56:51 2009

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newmediamusings.com
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UFOs caught on tape Not a hoax but from the ap mexico city mexican air force pilots filmed 11 bright rapidly moving objects in the skies that an expert said proved the existence of UFOs but defense

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rc-airplane-world.com
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A single channel pistol grip style transmitter is used to control the altitude of the UFO through motor speed control These little toys are a great deal of fun for something so simple An rc UFO is a great product for anyone who wants a different kind of radio control aircraft particularly one that can be flown around the home without the complications of learning

From Yahoo Image Search: "UFOs"
Fri Jun 26 16:57:36 2009

 UFOs - MercuryMarauder.net Forums
mercurymarauder.net
UFOs - MercuryMarauder.net Forums

RF Overlord

Fri, 19 Jun 2009 17:15:25 GM

Another semi-serious question: Why do all . UFOs. look different? Some are saucer-shaped, some are cylinders, some cigar-shaped, some round, some small, some huge... are the visitors from THAT many different planets that they have so many ...

UFOMystic Swedish UFOs
ufomystic.com
UFOMystic Swedish UFOs

Nick Redfern

Wed, 10 Jun 2009 07:56:42 GM

We also get Clas to speculate on how much of the . UFO. activity over Sweden can be attributed to their closeness to Russia and their potential testing of experimental craft. We also get his take on the possibilities that the Swedish . UFOs. ...

 Ufos Fleet Panama - Video
metacafe.com
Ufos Fleet Panama - Video

Ufonetproof

hu, 18 Jun 2009 01:40:39 GM

News 2009 video original : . UFOS. fleet panama. Watch Video about . UFO. ,Sightings,Crop​ circles by Metacafe.com.

From Google Blog Search: "UFOs"
Sun Jun 21 21:37:41 2009