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    MATERIAL FROM CLASS 9: Wednesday October 4

    The Ring nebula: we point our telescope at the points
    A a hot white dwarf star in front of (most of) the gas of the nebula
    B a star behind the gas of the nebula
    C 'empty' space
    D glowing gas in the nebula.
    [Image: ring nebula]
    Can you use Kirchhoff's laws to explain why we see spectra like this?
    What element is most common in this gas?
    [Spectra: ring nebula]