[baudrunner]

RE: not exclusive to stars..

Suns are what happens when a lot of matter accumulates in one place. Worlds are what happens when only so much matter accumulates in one place. Jupiters are what happens when not enough matter accumulates in one place to create a sun but too much matter accumulates to create a world. Worlds and giant planets like Jupiter have their own satellites and their revolution around their parent bodies are effected by the same influence that effects the revolution of the planets around a sun. Gravity is not "created ' by a sun, it is the result of the spatial displacement of a massive object.