Definition : Unidentified Flying Object
Category : Miscellaneous » Fictional
Country/Region : Worldwide Worldwide
Popularity :

What does UFO mean?

An unidentified flying object (usually abbreviated to UFO or U.F.O.) is any unusual apparent object in the sky whose cause cannot be identified by the observer; though (in a narrower definition) used by investigators and in popular usage, it more loosely refers to alien spacecraft