Galaxies - Descriptive Astronomy Lecture

This is a Descriptive Astronomy (ASTR110) lecture titled, Galaxies.
Topics
0:00 Introduction
1:36 “Island Universes”
5:35 Spiral Galaxies
9:28 Elliptical Galaxies
16:45 Irregular Galaxies
18:45 Measuring Masses and Distances to Galaxies
30:47 The Expanding Universe and Hubble's Law
This lecture series follows the “Astronomy” text. Produced by Openstax (openstax.org/)