Unidentified flying object (commonly abbreviated as UFO or U.F.O.) is the popular term for any apparent aerial phenomenon whose cause cannot be easily or immediately identified by the observer. 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 today the term UFO is colloquially used to refer to any unidentifiable sighting regardless of whether it has been investigated. Another widely known acronym for UFO in Spanish, French, Portuguese and Italian is OVNI (Objeto Volador No Identificado, with variant regional spellings). 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.

Though the term ETV (ExtraTerrestrial Vehicle) is used for a small subset of UFO studies in the public's mind the term UFO is more commonly used as a synonym for alien spacecraft and many discussions of UFOs revolve around this presumption.. UFO enthusiasts, contactees, and devotees have created organizations and religions that have adopted extraterrestrial themes, and in general the extraterrestrial UFO concept has evolved into a prominent mythos in modern culture.

UFO sightings by the masses increased precipitously after a widely publicized incident reported by private pilot Kenneth Arnold in 1947 that also gave rise to the popular terms "flying saucer" and "flying disc." Studies have established that most UFO sightings 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, while a small percentage of reported UFOs are hoaxes. The possibility that all UFO sightings are misidentifications of known natural phenomena inspired some debate in the scientific community about whether scientific investigation was warranted given the paucity of available empirical data. Very little peer-reviewed literature has been published in which scientists have proposed, studied or supported non-prosaic explanations for UFOs. Nevertheless, UFOs as a cultural phenomenon continues to be the subject of serious academic research and amateur investigators continue to advocate that UFOs represent real and unexplained events.

From Wikipedia under the GNU Free Documentation License
Sun May 30 16:14:54 2010

If I were President and called a press conference to tell you that aliens and alien spacecraft are here?
Q. And that we are almost competely powerless in the face of their superior technology? And that there isn't a darn thing I can do about any of it? That you are on your on? That the government has been cooperating with aliens in the abduction of U.S. citizens? What, other than misguided laughter, would be your response?
Asked by In Honor of Moja - Sun Mar 25 13:05:22 2007 - - 3 Answers - 0 Comments

A. Well, i've been doing the same research, and agree 100%. Those in denial may well be "shocked to death" when the reality intrudes. Oh, well. They can always go back to their usual drugs, including fundy "christianity" and nascar, eh? :)) Btw, have you checked out ? One should note, for balance, however, that there are numerous benevolent extra terrestrial and extra dimensional beings on "our" side, luckily:))) Cheers!!
Answered by drakke1 - Sun Mar 25 14:05:26 2007

I need to know what I do if I just accidentally alien spacecraft?
Q. I need to know what I do if I just accidentally alien spacecraft?
Asked by micha EL - Thu Mar 25 06:14:14 2010 - - 9 Answers - 0 Comments

A. same thing you do if you accidentally a whole bottle of coke
Answered by David - Thu Mar 25 06:15:35 2010

how should humans react to alien spacecraft?
Q. how should humans react to alien spacecraft?
Asked by master<>drugd1 - Fri Oct 10 14:27:25 2008 - - 7 Answers - 0 Comments

A. As with any uninvited stranger: wary, but hopeful.
Answered by Clavius - Fri Oct 10 15:08:38 2008

From Yahoo Answer Search: "alien spacecraft"
Sun Jul 4 10:11:45 2010

Cameron emerges from Titanic's wake with Avatar - Toronto Star
news.google.com
Cameron emerges from Titanic's wake with Avatar

Toronto Star

"I don't even remember the transition point from being a fan reader of science fiction and as an artist drawing things, drawing spacecraft , drawing aliens, ...



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Calif.-raised 'Skyrunner' star Blatz settles in to life in Toronto - The Canadian Press
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Calif.-raised 'Skyrunner' star Blatz settles in to life in Toronto

The Canadian Press

The boys seize the saucer as their own personal spacecraft , and soon, "weird stuff starts happening to Tyler," says Blatz. Not surprising, given that Tyler ...



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Eight alien satellites of ISRO set to launch - Little About (blog)
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Eight alien satellites of ISRO set to launch

Little About (blog)

... engrossed in exploring so as to get hold of such spacecraft from abroad to expand capacity in the realm of communication transponder back home. ...



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From Google News Search: "alien spacecraft"
Sun May 30 16:14:57 2010

Alien Spacecraft jpg
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Alien Spacecraft jpg
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Alien Spacecraft

hdidzah888003 thumb 550x392 18084 jpg
dvice.com
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via DVICE Atom Feed by Adario Strange on 5 15 09 The age of mobile museums and public pavilions continues to be pushed forward by futuristic designer Zaha Hadid For an upcoming ecology focused exhibit in Chicago s Millennium Park the

CURRY SNAIL by Digital Art
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CURRY SNAIL by Digital Art
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Spectacular spirals 3 24 Available for sale as T Shirts

From Yahoo Image Search: "alien spacecraft"
Tue Aug 17 14:25:47 2010

Current Issues in Mathematical Physics: Cassini Spots Miles-long ...
tetrahedral.blogspot.com
Current Issues in Mathematical Physics: Cassini Spots Miles-long ...

Steven Colyer

Mon, 12 Jul 2010 06:19:00 GM

OK fine and sorry, I'm just kidding about the "objects" (propeller "moonlets") spotted by Cassini halfway along the outermost A-Ring of Saturn being . Alien spacecraft. , but whatever they are (probably new moons in the process of ...

Unsolved Mysteries: UFOs | UFO World News
ufoworldnews.com
Unsolved Mysteries: UFOs | UFO World News

UFOGuy

Wed, 21 Jul 2010 13:00:58 GM

Unsolved Mysteries talks to a former employee there who says an . alien spacecraft. is stored there, measuring 53 feet in diameter. Hudson Valley UFO- during a 3 year period residents reported seeing enormous wedge-shaped light formations. ...

Top 10 Most Treacherous Stories Ever
mspraveen.posterous.com
Top 10 Most Treacherous Stories Ever

unknown

Sat, 19 Jun 2010 12:38:00 GM

In 1947, a mysterious crash that the US military says was a surveillance balloon sparked the most enduring alien conspiracy of all that it was in fact an . alien spacecraft. that was wrecked in Roswell, NM, and that the government has ...

From Google Blog Search: "alien spacecraft"
Wed Jul 21 22:41:51 2010