The existence of retrogra
The existence of retrograde motion is one problem with the ELS model of the formation of these entities and prompt initial enhancement is one theory proposed to solve another problem with their composition. Axisymmetric potentials like the Miyamoto-Nagai, Kuzmin, and Toomre ones are used to model these objects. The NFW profile models the halo of dark matter surrounding these structures. Another class of them undergoes ram-pressure stripping where they lose much of their free gas. Vera Rubin, while studying these structures' rotation curves, noted a discrepancy between mass and rotational velocity that, combined with the data of Fritz Zwicky, was used to propose the theory of Dark Matter. FTP, name these structures which Hubble classified into a tuning fork diagram, that come in Irregular, elliptical, and Spiral forms.
The existence of retrograde motion is one problem with the ELS model of the formation of these entities and prompt initial enhancement is one theory proposed to solve another problem with their composition.
galaxies [Accept more specific answers]