The Hertzsprung–Russell diagram is a scatter graph of stars showing the relationship between the stars’ absolute magnitudes or luminosities versus their spectral types or classifications and effective temperatures. Hertzsprung-Russell diagrams are not pictures or maps of the locations of the stars. Rather, they plot each star on a graph measuring the star’s absolute magnitude or brightness against its temperature and color.
Source: Investigating Stars, Investigating Astronomy, TERC
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I almost had you memorized down pat freshman year… can’t say the same now! Haha~
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this is one of the only things i retained from physics.
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