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Henry Norris Russell died on 1957-02-18.

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Henry Norris Russell died on 1957-02-18.

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Henry Norris Russell was born on 1877-10-25.

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Hard attack

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The Hertzsprung-Russell diagram was created - as the name suggests - by Ejnar Hertzsprung and Henry Norris Russell in 1910

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Ejnar Hertzsprung and Henry Norris Russell,working independently, realized the relationship between a star's temperature and its brightness.

Together, in 1910, they formed what is now known as the Hertzsprung--Russell diagram or HR Diagram.

It's a scatter graph showing the relationship between a star's absolute magnitudes, their spectral types and temperatures.

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