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Interesting Hertzsprung–Russell diagrams
Two very interesting images about the H-R diagram!
The Hertzsprung–Russell diagram is a scatter graph of stars showing the relationship between the stars’ absolute magnitudes or luminosity versus their spectral types or classifications and effective temperatures.
This diagram below is a plot of 22000 stars from the Hipparcos Catalogue together with 1000 low-luminosity stars (red and white dwarfs) from the Gliese Catalogue of Nearby Stars.
