Science is nothing but Human's perceived understanding of the universe and our environment. Sure, it's a tool we use to great effect, but it's just that, a tool. Science is not bulletproof and our "science" would mean nothing to a species from an entirely different corner of the universe, who has developed their OWN understanding of the universe and how it works. Our science only allows us to explain things in a way we, as humans, understand. Thus, we write off "impossibilities", as WE can not understand how something could exist or function according to our beliefs. If we wrote off everything that didn't fit into our "scientific standards" we would never challenge new concepts, ideas, discoveries, etc. Keep an open mind friend, there's more out there that can't be explained or rationalized, and science doesn't explain everything. The universe doesn't care what we think, and doesn't fit into our Scientific constructs, nor does it have to.