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