Hertzsprung-Russelldiagram

Hertzsprung-Russelldiagram
Hertz·sprung-Rus·sell diagram (hĕrts'sprŭng-rŭsʹəl) n.
A graph of the absolute magnitude of stars plotted against their surface temperature or color, used in the study of stellar evolution.
  [After Ejnar Hertzsprung (1873-1967), Danish astronomer, and Russell, Henry Norris.]

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Universalium. 2010.

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