Charting the stars The Hertzsprung-Russell diagram
Jul 18, 2019
2 minutes
“When the hydrogen fusion reactions end, the star’s position in the HRD moves away from the main sequence”
In the early 1900s the astronomers Ejnar Hertzsprung and Henry Russell placed stars in a plot of a measure of a star’s luminosity – the amount of energy a star radiates in a fixed amount of time – against
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