@vicgrinberg I know this may go unnoticed. Which is fine. Totally fine. At least I'm willing to try. Anyways, this is how I describe the physics of the Milky Way galaxy in the natural Universe. Is this:
Galaxies hold shape and rotation due to the Tropic Field Extremum's gravitational entrainment upon the stellar mass that is stabilized by the angular momentum trajectory of the host galaxy.
**Tropic Field Extremum**: is the gravitational "bowl" (not) a singularity. Like a skate bowl at a park.