If we knew enough about a UFO to know how old it was or even how to tell its age, it would not be unidentified, we would have to know what it was.
UFOs can appear as anything the human mind can imagine... for obvious reasons. My favorite was during the '73 UFO flap-- some old lady said she'd seen a UFO. When they asked her how she knew it was a UFO, she said it had the letters UFO on it!
Jack the Lad Swing
Space rocks, bits of old rockets and UFO's.
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