[Bub the Zombie]

Given the amount of sightings around the world over the years, it seems like a possibility of them being real.

But taking other facts into consideration, such as, why hasn't there been actual contact with any lifeforms from another world till now? If they are technologically superior in every aspect, surely they could have contacted or "invaded" (like numerous sci-fi B-movies) us by now.

The whole situation is a paradox. If you are willing to believe in them, you have a huge load of doubts to clear. If you are not prepared to believe in them, you are presented with another huge load of beliefs.

Einstein's theory of relativity? The Philadelphia Experiment? Objects so designed that they fly past the speed of light?

It's possible, you might argue. But is it feasible? Yes? No? Maybe?

It depends on how you analyse the whole situation, and what your ultimate viewpoint on the matter really is.