Galaxies+&+The+Universe+Study+Guide

Galaxies & The Universe Study Guide

How are galaxies classified? Describe the characteristics of each of the types of galaxies. What is a nebula? What is the difference between a globular cluster and an open cluster? How do scientists learn about how galaxies may have formed? What is a quasar? What is cosmology? How do we know the universe is expanding? //Describe// the big bang theory. What do scientists believe caused the Big Bang? How does cosmic background radiation provide evidence for the big bang? Describe the structure of the universe. How old do we think the universe is? How do scientists calculate this? What do scientists think will eventually happen to the universe?