When the absolute magnitudes, or brightness's, of stars are plotted against their surface temperatures or colors, we obtain an H-R Diagram.
What is the use of a H-R Diagram?
First it is important to note that the full meaning of H-R in this case is:
Hertzsprung-Russell.
The Hertzsprung-Russell Diagram is an instrument or device that is used for studying starts and other celestial bodies.
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