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Charles Greeley Abbot (May 31, 1872 - December 17, 1973) was an American astrophysicist and also the fifth secretary of the Smithsonian Institution, serving from 1928 until 1944. Abbot went from being director of the Smithsonian Astrophysical Observatory, to becoming Assistant Secretary, and then Secretary of the Smithsonian Institution over the course of his career. As an astrophysicist,

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