Oort's A and B, radio rotation curves. Evidence for dark matter in our galaxy and others. Perturbations from galactic rotation. Determination of Ro. Chemical abundance gradients in disk and halo.
Chemical abundances in stars and gas.
Theory Models such as Bahcall and Soneira. Dynamical models of galactic evolution. Chemodynamic models of galactic evolution. A Newtonian picture of expansion. Principles of radiative transfer.