UFOs: Fact or Fiction?

It doesn't matter if a person believes in something to exist or not. What matters is that we continue to search. The chances of there not being any extraterrestrial life are far outweighed by the odds of there being extraterrestrial life. The great distance between inhabitable planets makes it a challenge to investigate (even via remote sensors). I think Stephen Hawking said it best when he said "If aliens visit us, the outcome could be much like when Columbus landed in America, which didn't turn out well for the Native Americans, Such advanced aliens would perhaps become nomads, looking to conquer and colonize whatever planets they can reach."

Hard one. Maybe because I actually hope there are others out there that I choose to say Fact. Who knows. Just too many planets that can support life to think we are all there is in this huge universe.