• Born date: 1900-05-10
  • Born in: Buckinghamshire
  • Death date: 1979-12-07
  • Death in: Cambridge, Massachusetts
Cecilia Payne-Gaposchkin

Cecilia Helena Payne-Gaposchkin (May 10, 1900 – December 7, 1979) was a British-American astronomer and astrophysicist who, in 1925, proposed in her Ph.D. thesis an explanation for the composition of stars in terms of the relative abundances of hydrogen and helium.