Harlow Shapley

Harlow Shapley

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Caption: Harlow Shapley (1885-1972), US astronomer, the first to determine the size and shape of our galaxy, the Milky Way. Shapley graduated from the University of Missouri with an astronomy degree in 1911, and gained his PhD from Princeton two years later. His major work was on Cepheid variables; stars which vary in brightness with a period related to their luminosity. He studied the distribution of these stars in globular clusters (huge spherical star clusters). From this, he determined that the Milky Way was disc-shaped, that globular clusters were distributed around its center both above and below the disc, and that the Sun was a considerable distance from the center.

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Keywords: american astronomer, astronomers, black and white, cepheid variables, galaxy, harlow, harlow shapley, historical figure, historical figures, history, man, milky way, people, portraits, science, scientist, scientists, shapley, surname s, universe

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