Referring to the Hertzsprung-Russell diagram, a scatter plot that shows the relationship between stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures. This diagram reveals patterns in stellar evolution and helps classify different types of stars.
Named after Danish astronomer Ejnar Hertzsprung and American astronomer Henry Norris Russell, who independently developed similar diagrams in the early 1900s. Their work revolutionized understanding of stellar properties and evolution.
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