Review Chapters 7-10
• Chapter 7: The Sun
– Atmospheric Structure
• Temperature, density, etc., with radius
– Sunspots/Magnetic Phenomena
• What are they?  Why do they exist?
– Nuclear Fusion – proton-proton chain
• What is it?  How does it produce energy?
– Solar Neutrino “Problem”
• What is it?  Is it still a problem?