Cecilia Payne-Gaposchkin

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Cecilia Payne. 1900 - 1979. Astronomer

Cecilia Helena Payne-Gaposchkin was a British-born American astronomer and astrophysicist who proposed in her 1925 doctoral thesis that stars were composed primarily of hydrogen and helium. Wikipedia Born: 10 May 1900, Wendover Died: 7 December 1979, Cambridge, Massachusetts, United States