I have what may possibly be deemed a stupid question, but please bear with me.
According to the FE model, what keeps the sun, moon, and other celestial bodies from falling onto the earth?
Not to be pedantic but the only universal FE model is short, sweet and limited: the earth is flat. No more and no less.
As far as the celestial "bodies" falling onto the earth is concerned, have no worry. They are not physical bodies at all. So, they can not fall to earth.
It seems obvious to me that the moon is a reflection of the earth up onto the firmament. That is why we always see the same surface. Likewise, I believe the sun is a consequence of energy focused by parabolic reflection from a different direction. I can not prove any of that nor do I care to but there is no mystery to me about why they both seem to be the same size. Regardless, I do not fear any of those celestial "bodies" falling.