There is as much evidence for UFO's visiting the earth as there is for Yahweh , Zeus, Elves still alive, trickle down economics working, compassionate conservatism, fairies, vampires . . . If any of my atheist friends subscribe to such nonsense, I consider the damage done to their critical thinking by religious myth still present.

I do believe in aliens and ufo's. I also believe in ghost.

I am pretty sure they are not real. If they were real i would think it more likely to be visited from a multiverse than from our own galaxy.

I would say yes I do. If you use historical monuments, locations and various works of art as proof. I have never seen nor heard of proof of anything resembling divinity. So yeah there has to be intelligent life up there.

Let's attack this by breaking it down into the various components contained within the question and the following comment.

"Do you 'believe' in aliens?" That depends on what you mean by 'believe' and 'aliens'. Let us say that I accept the notion (not the same as believing) that there probably are other places in the universe with life. Perhaps a small percentage of them are home to an intelligent species or more. Then a small percentage of that group may house intelligent species that have attained some level of technology. Following on that, a few may even have become spacefaring.

"Do you 'believe' in UFOs?" Let us say I accept the idea (again not the same as believing) that people have seen things in the sky that were not identifiable to them. Most of those sightings have rather mundane explanations. Some of them a mite more exotic. A tiny percentage remain unidentified. It is a rather gigantic leap to go from seeing something that doesn't fit into any particular category to declaring it is a craft operated by aliens. No evidence, you see.

As for the rest of it, there is also no evidence -- just anecdote, dubious photos, and unreliable testimony. Yes, I know some 'credible' folks have seen these things as well, but we still have to make that incredible leap.

Abductees? Barney and Betty Hill remains the best case for actual abduction, but again, lacking substantial and testable evidence. All I can conclude at present from all those reports is that it could be anything from a bad batch of moonshine to an actual abduction, but I can't know anything about it, yet. I do have some direct experience with someone who became rather famous among UFO buffs many years ago. He was George Van Tassel. George was a friend. I was around during all of his revelations. That one did not help the UFO crowd one bit.

I, and many other scientists in this world would be delighted to have evidence. It could and probably would be one of the greatest enlightening experiences of all time. It would certainly change a lot of people's way of thinking. My friend, Seth, would go bananas -- honestly, so would I. In the meantime, we continue to look, listen, and wait for evidence.

I believe in UFO's as defined, An unidentified, flying, object. That's it, just something in the sky that can't be readily identified.

As for the rest, I'm going to with wanting empirical evidence before I can come to an educated conclusion.

Who cares what anyone 'believes' about UFOs? With no evidence, this 'belief' is just as valid as religious beliefs, and anyone who says they have seen one with no evidence is either hallucinating, or an attention seeker.

I want to badly believe it as I want to hitch a ride home...ahem out of this planet but no I don't believe any are here. As about out there, yes they're just too far or maybe they don't want to be bothered...

That show "Ancient Aliens on the history channel is actually interesting sometimes !

Ha! No, at least not any seem to have visited us yet. I don't doubt that there's some sort of alien life form out there somehow, or that there was, or that there will be -- indeed, I suspect there are, were, or will be advanced civilizations akin to our own, but will we ever be able to contact them? That I question.

On a par with ghosts, big foot, etc. Could you cite Stephen Hawking's quote and source please?

No, I do not believe there are aliens on Earth.

I believe in the possibility of intelligent alien life forms. But as with all things you gotta show me hard evidence.