Henry Norris Russell, US astronomer

Henry Norris Russell, US astronomer

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Henry Norris Russell, US astronomer, looking down a microscope. Russell (1877-1957) developed the Hertzsprung-Russell diagram in 1910, which showed a correlation between spectral types and absolute magnitudes of stars. Before this, he studied astronomy at Princeton University, USA, obtaining his degree in 1897 and his doctorate in 1899. He also earned the Gold Medal of the Royal Astronomical Society in 1921.

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