The week Aliens

There are billions of solar systems, billions of galaxies,I am sure i don t need to state that some where out there, there must be a possibility that we are not alone. I mean come on, regular peoples thoughts fail to grasp the size of our Sun, let alone Solar System, let alone our galaxy, and the galaxies well beyond. I also believe in parallel universes, how can as some thing as big as Earth, have such a small gravitational pull on beings such as our self? Gravity is weak. Or are we just sharing it with other beings, other us if you like to put it that way.