Hertzsprung-Russell Diagram Definition

A graph of the absolute magnitudes or luminosities of stars plotted against their surface temperatures or colors, used to classify stars by their evolutionary stages.
American Heritage

Origin of Hertzsprung-Russell Diagram

  • After Ejnar Hertzsprung (1873–1967), Danish astronomer, and Henry Norris Russell

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Ejnar Hertzsprung and Henry Norris Russell, astronomers

    From Wiktionary

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