What is the source of dynamic kinorotational energy of our Galaxy? Should it not come from outside? Suggesting that almost every object from microscopic to galaxy clusters must have an outside engine. For example for Earth it is Sun, for Sun (solar system) it is galactic centre...yes one big source can tackle multiple objects like sun tackling many planets. The point which I am trying to understand is that no object in the universe (other than the whole universe) is without its partner, practically all linked together.