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    | • | 
    Chapter 9: Formation and Structure 
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    of Stars 
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    | • | 
    Interstellar
    Medium and different sorts of nebulae, 
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    reddening 
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    Protostars,
    star formation (on HR diagram) 
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    Fusion
    in stars 
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    – | 
    CNO
    cycle 
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    – | 
    Heavy
    element fusion 
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    | • | 
    Lifetimes
    on the main sequence 
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    | • | 
    The
    Orion Nebula as a star-forming region 
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