MoND fits galaxy rotation curves really well.

The baryons (visible matter) seem to be calling all the dynamical shots.

Galaxy luminosity functions in different environments; the Schechter law does a good job in all, but individual galaxy types are all quite different.

Galaxy luminosity functions in different environments; the Schechter law does a good job in all, but individual galaxy types are all quite different.

Hubble’s distance-velocity diagram.

A more modern version.