Chapter 15  Galaxies

 15-01 Galaxies outside the Milky Way

 15-02 Shapes of Galaxies

 15-03 Distance to Galaxies

 15-04 Galaxy Clusters

 15-05 Galaxy Collisions

 15-06 Mass of Galaxies and Galaxy Clusters

 15-07 The Hubble Law

 15-08 Formation and Evolution of Galaxies