Formation of Stars and Galaxies. Introduction 1.Timeline and Big Bang.
The Structure of the Universe AST 112. Galaxy Groups and Clusters A few galaxies are all by themselves Most belong to groups or clusters Galaxy Groups:
How many stars? Between 1,000,000,000,000,000,000,000 and 1,000,000,000,000,000,000,000,000
What forms the “texture” of the universe? Figure 25.29 from book.
