UFO - no longer unidentified

Take a look at this link..

www.nasa.gov...

What do you guys think?

UFO's are alien spacecraft. It's either man made or not.

No, a UFO is just that. An Unidentified Flying Object. When the F-117 was first seen flying it was a UFO because no one knew what it was. UFO has come to MEAN alien spacecraft, but it's not necessarily an alien spacecraft. It's simply something seen flying that can't be identified.