1. Physics 202: Introduction to Astronomy – Lecture 21 Carsten Denker Physics Department Center for Solar–Terrestrial Research

2. April 26, 2006Center for Solar-Terrestrial Research The Universe of Galaxies  Hubble’s classification of galaxies: spirals, barred spirals, ellipticals, and irregulars  Collisions  Clusters  Distance scale Planetary nebulae Type I supernovae  Tully-Fisher relation  Local group  Virgo clusters  Superclusters  Hubble’s law  Cosmic expansion

3. April 26, 2006Center for Solar-Terrestrial Research Spiral Galaxies

4. April 26, 2006Center for Solar-Terrestrial Research Barred-Spiral Galaxies

5. April 26, 2006Center for Solar-Terrestrial Research Elliptical Galaxies

6. April 26, 2006Center for Solar-Terrestrial Research Irregular Galaxies

7. April 26, 2006Center for Solar-Terrestrial Research Tully-Fisher Relation

8. April 26, 2006Center for Solar-Terrestrial Research Galactic Neighborhood

9. April 26, 2006Center for Solar-Terrestrial Research Clusters and Superclusters

10. April 26, 2006Center for Solar-Terrestrial Research Hubble’s Law