User blog comment:BeyonderGodOmnipotent/Do You Believe In Aliens?/@comment-1197011-20150516163355

I believe in aliens, but I admit there's no scientific reason to it, it's more about my intuition which tells me that life's probably a universal phenomenon. I don't think life can only exist as a result of a very specific set of chemicals, under specific environmental constrains. Life on Earth evolved to be carbon-based and water-based, but there may be other types of life out there. Life's the product of its environment, and I believe there ought to be as many kinds of life as there are environments. But hey, maybe I'm wrong, who knows?

As for fearing them: yes and no. If the universe is so vast and populated by so many forms of life as I believe it is, it's almost certain that some of them ought to represent danger for us. But that's just one of the risks we have to live with, just like nuclear warfare or supernovas. It might happen one day, regardless of whether we go to space or remain here on Earth. I don't think we should stop space exploration for fear of hostile aliens, that would be the cosmic equivalent of never leaving your home because there may be criminals outside.