It does, supercomputer simulations demonstrate that our current models of gravity can account for the spherical shape of stars and planets.
Gravitational and anything.
No, galaxies form by the collapse of roughly spherical clouds of matter. Their disk structure forms because of conservation of angular momentum and the matter bumping into itself. A single disk of material generally doesn't have much material bumping into one another. If you have two disks of material rotating about the same central region but in different planes then their constituents will collide with one another, altering the same. This settles down into a stable disk configuration. Angular momentum and collisions, its all explained by them.
The Moon is believed to ave been formed by a Mars sized object hitting a proto-Earth. The huge energies involve liquified the pretty much the entire planet and threw off a molten chunk. Gravitational forces would then be sufficient to cause the molten material to being spherical fast enough that it happened before it cooled enough to become rigid. That's pretty much the definition of a planet, one which is sufficiently massive that it could become spherical before it cooled to solid.
The mass melted because the collision of 2 objects with massess of about 1,000,000,000,000,000,000,000,000 kilograms at 50km/s results in so much energy output that it'll melt rock easily. Think a billion nuclear weapons going off at once and you're getting there.
Just because superheated molten rock flows like a liquid doesn't mean aether has anything to do with it. Nothing I said involves aether. Two objects collide, which releases energy. This energy melts the objects. The objects' gravity causes them to become spherical before they cool. They then cool to form solid spheres.
It's not hard to tell at all, I didn't. Mentioning a liquid doesn't mean we're talking about aether. Aether is a fluid but not all fluids are aether. Even someone as irrationally stupid as you should manage to grasp that logic.