This is logically impossible. if you know its a coin it cannot be unidentified. for it is a coin!
Air +metal= ufo
Alien+rocket=UFO
Alien+rocket=UFO
No
active robot+glass+metals+air
This question does not even make sense.
By make and model number.
Depends...... You could just throw a frisbee in the air, and it could be an UFO Or........... You could make a real jet powered one. You just need more resources, a intelligent mind, and of course a vast imagination!
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
Probably at night if you glance at it, but I'm so interested in the UFO conspiracy, that when I see a plane at night I make sure it's just a plane........