The Big Bang Theory: The Big Bang Theory is one of many theory's on how the universe was created. From what i have learned of it, the universe was thought to have been created by to atoms (or particles) colliding together and causing a massive explosion which created the universe we know today. But what i don't understand is how the two atoms (or particles) would've collided without a force acting upon them. One of Isaac Newtons laws states, "An object at rest remains at rest unless acted on by an outside force". can any please explain how the atoms (or particles) collided then?