Astronomy Answers: From the Astronomical Dictionary

Astronomy Answers
From the Astronomical Dictionary

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the Hertzsprung-Russell Diagram

The Hertzsprung-Russell Diagram is a diagram showing a measure for the brightness of stars (usually along the vertical axis) against a measure for the temperature of stars (usually along the horizontal axis). This kind of diagram was invented around 1910 by Ejnar Hertzsprung and Henry Norris Russell. It turns out that stars concentrate in certain parts of such a diagram, depending on the phase of their life.