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Title: H.N. Russell
Caption: Henry Norris Russell (1877-1957) was an astronomer who developed the Hertzsprung-Russell diagram, which showed a correlation between spectral types and absolute magnitudes of stars.
Credit: Album / Science Source / OMIKRON
Image size: 3896 × 4669 px | 52.0 MB
Print size: 33.0 × 39.5 cm | 1533.9 × 1838.2 in (300 dpi)