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Examples
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Ejnar Hertzsprung (18731967) studied double stars and their colors, especially in the Pleiades, and with Henry Norris Russell (18771957) devised the Hertzsprung-Russell Diagram, a graphic way of grouping stars by the relation between their absolute magnitudes and spectral types.
1910-13 2001
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In the early twentieth century, astronomers Ejnar Hertzsprung and Henry Norris Russell prepared the first plot of stellar temperature as a function of luminosity, or brightness.
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