It could be anything at all. If we knew what it is, then it would simply be
a "FO", because it would no longer be "U".
Plane Balloon Satellite Shooting Star Blimp Meteor Helicopter
They might be visible because if people have not seen them then why they would name as Unidentified Flying Objects. The UFO's disturb your radio signals and satellite if they exist.
a UFO See http://grammar.ccc.commnet.edu/grammar/abbreviations.htm (all the way to the bottom) for help determining when to use a or an before an abbreviation.
Ufo's do exist because a Ufo is a thing in the sky that you can not explain.
They usually see UFO's at a UFO sighting
movies that have UFO's in them i guess
It is unknown what is inside of a UFO.
The 'F' in UFO stands for "Flying". UFO is an acronym for Unidentified Flying Object.
You put the rod in the UFO and
Air +metal= ufo
Alien+rocket=UFO
If a UFO was found by a person, then it was no longer flying and no longer unidentified; therefore, no longer a UFO.