As far as aliens go....When you look up into the night sky and see all the little lights up there, those aren't stars. They're galaxies. Millions of galaxies, which contain millions of solar systems, which contain many more planets. You don't think there's a chance that one of those planets out of all x,xxx,xxx,xxx,xxx,xxx,xxx,xxx,xxx,xxx,xxx of them don't have any type of life on it?