Hertzsprung gap

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An area of the Hertzsprung–Russell diagram containing no stars, between the top end of the main sequence (where stars are more massive than the Sun) and the giant branch. Stars cross this region very quickly once they leave the main sequence because their outer layers are expanding rapidly. While the star's luminosity remains roughly constant, the surface temperature goes down so that the star follows an approximately horizontal path from left to right on the HR diagram.

Subjects: Astronomy and Astrophysics.

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