Astrophysics
Cecilia Helena Payne (later Cecilia Payne-Gaposchkin) published her doctoral dissertation at Radcliffe College in 1925. She had discovered that hydrogen and helium were the main content of stars. More than that, the spectral classes relate to the temperature of stars. Despite Eddington's suggestion, her discovery was so unexpected that her dissertation readers told her to modify the conclusion before publication. Later research confirmed her discovery. <3