Salaam,
I do not have information about this issue with respect to Quran. However, I do wonder why most of the people from USA have 'seen' UFO's ?? and not the other people? It's strange.....does a UFO only prefer USA to land [img]style_emoticons/default/laugh.gif[/img][img]style_emoticons/default/mellow.gif[/img] ...i dunno !
I used to believe that there are aliens (e.g green bodied, big headed) from other planets, but not anymore. If there were, believe me, they would have made their presence very 'clear' [img]style_emoticons/default/rolleyes.gif[/img]
Do keep in mind that 'sightings' and 'witnesses' of UFOs were mostly from 60's-80's. May be this has something to do with a fasination with these beings? I rarely hear about UFO witnesses 'now'.