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[[Image:Hertzsprung-Russell.jpg|thumb|300px|right|Hertzsprung-Russell diagram]]

[[Image:Hertzsprung-Russell.jpg|thumb|300px|right|Hertzsprung-Russell diagram]]

The '''Hertzsprung–Russell diagram''' is a type of chart showing the connection of temperature and brightness in stars. The diagram illustrates three groups of stars; the main sequence, the giants and supergiants, and the white dwarfs.

The '''Hertzsprung–Russell diagram''' is a type of chart showing the connection of temperature and brightness in stars. The diagram illustrates three groups of stars; the main sequence, the giants and supergiants, and the white dwarfs. It is named after the astronomers [[Ejnar Herzsprung]] and [[Henry Russell]]<ref> ''Universe: The Definitive Visual Guide'' (2005), DK Publishing , page 232.</ref>