Hertzsprung-Russell diagram

== English == === Etymology === After astronomers Ejnar Hertzsprung and Henry Norris Russell. === Noun === Hertzsprung-Russell diagram (plural Hertzsprung-Russell diagrams) (astronomy) A graphic representation of the absolute magnitude of stars against their color (or surface temperature), which shows the main sequence of stars plus the white dwarfs and red giants. ==== Synonyms ==== HR diagram H-R diagram ==== Translations ====