Stars in the universe vary in size, luminosity, and temperature. The Hertzsprung-Russell diagram helps astronomers categorize the stars.
blue giants
1,000,000
red supergiants
10,000
100
Standard of Comparison
Sun = Luminosity Value of 1
red giants
1
main sequence
Sun
1/100
ОО
white dwarfs
1/10,000
main sequence
40,000
20,000
10,000
5,000
2,500
Temperature (K)
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