1	Review Chapter 12: Milky Way The discovery of the Galaxy Variable stars as distance indicators Globular clusters The size and overall structure of the Galaxy 21 cm Hydrogen emission Motions in the galaxy The Halo The Disk population Spiral Arms The Nuclear Bulge The Rotation curve and the Galaxy’s mass The origin of the galaxy The Galactic Center
2	Chapter 13: Galaxies Family of Galaxies Classification Properties of Galaxies Distance; The Hubble Law Size and Luminosity Mass (including Dark Matter) Evolution of Galaxies Clusters Mergers
3	Chapter 14: Galaxies with Active Nuclei Discovery of Active Galactic Nuclei (AGN) Seyfert Galaxies and Radio Sources The Unified Model Black Holes in Galaxies, disks, orientation, + Quasars Distances and Relativistic Redshifts Quasars as extreme AGN Evolution of Quasars/Galaxies Gravitational Lensing
4	Chapter 15: Cosmology The Hubble Expansion – review+ Olber’s paradox The Big Bang Refining the Big Bang Details of the Big Bang General Relativity Cosmological Constant Origin of Structure
5	Exam #3 on Mon., April 19 Sample questions. The assumption of Isotropy states that A. The universe looks the same at all epochs. B. The universe looks the same from all locations over large enough distances. C. The universe looks the same in all locations over large enough distances. D. All of the above. E. None of the above.
6	Exam #3 on Mon., April 19 Sample questions. In order to determine the age of the universe, we require A. The universe to be flat. B. The amount of dark matter to be determined. C. The redshifts of galaxies in the Local Group to be measured. D. An accuration temperature of the background radiation. E. The Hubble Constant and the density of the universe to be determined. The center of our galaxy lies in the direction of the constellation of A. Ursa Minor. B. Ursa Major. C. Sagittarius. D. Orion. E. Andromeda.