I'm not sure if this has been discussed before, but in FET, what is the mechanism or driving force behind the motion of the Sun, Moon, stars, and planets in the sky? I am curious as to the "why" and "how" behind this motion.

I assume UA also acts on these celestial bodies in order for them to remain at the same distance from the surface of the Earth, but what makes them revolve around whatever vertical axis they revolve around?