That's what scientists get paid for.Honestly though.. there could be more plannets, solar systems out there.500 years ago they believed the world was flat, it is all to do with the power of our technollogy to get the advancement in our knollege and understanding of what is out there.Yeah you have to think deep, the rabbit hole goes deep.the universe we are living in is probably like what you would compare to our local area, go to work, sleep, drink, piss etc.. there is probably much more out there but we just aint reached capability to understand yet.we will probably have to evolve into humans with big heads for brains like aliens are made out so we can understand more.