[D/celestial] : added (untested) GalaxyDensity, a very simple model for the density of a galaxy
[D/celestial] : added (untested) GalaxyDensity, a very simple model for the density of a galaxy

PtrMan/WhiteSphereEngine,PtrMan/WhiteSphereEngine,PtrMan/WhiteSphereEngine,PtrMan/WhiteSphereEngine