Last weekend I was at the Festival of Chariots, and got talking to someone there. After asking what I did, she said "ah, you have a scientific brain; you don't believe in what you can't see".
That's not the case at all; if anything, science reminds us of the limitations of what we can see, and scientific rigor suggests we can't make authoritative claims on what we can't see - including claims as to whether or not such things exist.
In fact, only one of our senses works off-planet, and that is sensitive to a very narrow spectrum of photon energies. Much of what we currently "see", is visualized via artificial methods, i.e. sensory equipment and arbitrary interpretive processing.