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The Hertzsprung–Russell Diagram: Structures & Vocabulary

The Hertzsprung-Russell diagram organizes stars by luminosity or absolute magnitude versus surface temperature or a temperature proxy such as color or spectral type. The H-R diagram is one of astronomy's central diagnostic tools for estimating stellar radii, comparing populations, testing evolution, and determining ages of star clusters.

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The Hertzsprung–Russell Diagram: Structures & Vocabulary

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AST-336The Hertzsprung–Russell Diagram: Foundations→

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AST-338The Hertzsprung–Russell Diagram: Physical Mechanisms→

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The Hertzsprung-Russell diagram organizes stars by luminosity or absolute magnitude versus surface temperature or a temperature proxy such as color or spectral type.

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Stars occupy different regions because luminosity depends on radius and temperature, while stellar evolution changes both quantities over time.

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