3 ms·
> Because there is no reason to expect stars going around a galaxy to follow keplers laws for two body systems. The 'Kepler' law for galaxies are modified to a
by rotorblade 11y ago
> Because there is no reason to expect stars going around a galaxy to follow keplers laws for two body systems.
The 'Kepler' law for galaxies are modified to accommodate for a mass distribution. See e.g.:
https://en.wikipedia.org/wiki/Galaxy_rotation_curve#Halo_density_profiles https://en.wikipedia.org/wiki/Galaxy_rotation_curve#Halo_den...
- phkahler 11y agoNice article: This profile closely matches the expectations of a singular isothermal sphere profile where.... Why should the dark matter form a spherical blob? Right, because that's what makes Kepler behave better. But how the heck does the dark matter behave? Why should it take this distribution? It seems to be all made up to only explain observation, but not itself.