"UFO"s are real, and have been observed from many locations over many years.
"UFO" is the acronym for "Unidentified Flying Object". Thousands of people have seen things
in the sky that they couldn't identify. Therefore, since the observer in each case had no idea
what they were seeing, each one was, by definition, an unidentified flying object, or UFO.
And that's as far as you can go with it. If the question is asking about UFOs as spaceships,
things from outer space, carrying space aliens, abducting humans, there has never been a
shred of credible evidence of any of those things that stood up to serious examination.
Please check the related links for information about UFOs.
It is impossible to even speculate. There is no admitted proof that UFOs do exist and no hard information on propulsion.
Evidence is lacking as to whether unidentified flying objects originate from Mars. No answer as to the nature and origin of UFOs has been found in the course of any of the space probes or manned space flights thus far. Neither has an answer to the question of the point of origin of UFOs been found among any of the information gathered by the space station or by any of the earth-orbiting satellites.
Yes, there are.
There are many sites online with articles and information on UFOs; too many to list here. To get you started, I have posted the results page of articles you can read concerning UFOs below in Related Links.
That information is unknown, there are no reliable sources.
UFOs have been reported in virtually all of the states at one time or another.
None recorded.
UFOs aren't for sale. Any UFO's that may have been recovered would be in the possession of top military personel.
UFOs are by their nature, impossible to prove. If they were proven, they would be identified and would cease to be UFOs.
No accurate records exist.
Two offical sightings reported.