Imagine a universe with nothing in it exept for the earth. Now if you were to put a satalite up in space with a geosyncronized orbit, the gravity of earth would not pull the object down. but how can that happen if the earth is not spinning? At least not spinning relative to anything(because there is nothing), so there is no gravity at the altitude that the satalite is at. and if you were to place the satalite any further out it would just fly off into space. How can this happen? How can the satalite have an centrifical force(or momentum), if there is nothing to be moving relative to? and why wouldn't this happen in reality, or would it?