Cecelia Payne-Gaposchkin

Cecelia Helena Payne-Gaposchkin (May 10, 1900 – December 9, 1979) was a British-American astronomer and astrophysicist whose doctoral thesis revolutionized stellar astronomy. Born in Wendover, England, she studied physics at Cambridge University before moving to the United States to pursue graduate work at Radcliffe College. In 1925, her dissertation demonstrated that hydrogen and helium constitute the vast majority of stellar atmospheres and by extension, stars themselves—a discovery that contradicted the prevailing belief that stars had the same elemental composition as Earth. Despite the fundamental importance of her work, she faced systemic barriers as a woman in science and was long denied proper academic recognition and compensation. She eventually became the Phillips Professor of Astronomy at Harvard University, the first woman to achieve such a rank in the institution's astronomy department. Her legacy includes not only her transformative scientific contributions but also her role as a trailblazer for women in STEM fields. Payne-Gaposchkin published numerous papers and co-authored influential textbooks that shaped generations of astronomers.