1. What conditions are present in stars that cause hydrogen to form helium? What is this process called?
2. What are the major layers of the Sun? Which layer produces most of the light we see?
3. What two properties ofstars do scientists plot on a Hertzsprung-Russell diagram? Why do they choose these properties?
4. Explain how supernovae produce neutron stars and pulsars.
5. Explain how supernovae create the heavy chemical elements.
6. How did Edwin Hubble discover that there are galaxies in the universe other than the Milky Way
7. Describe Hubble's law. How did Hubble discover it?
8. Why does the existence of the cosmic redshift lead to the big bang picture of the universe?
9. What is the cosmic microwave background and what role does it play in cosmology?
10. What effect does dark energy have on the expansion of the universe?