Linked from
The 20 pages that link to Cecilia Payne-Gaposchkin, each with the reason it gives.
HydrogenRelated: Her work transformed understanding of hydrogen’s abundance in stars.
AstrophysicsRelated: Her spectral analysis transformed understanding of stellar composition.
Harlow ShapleyRelated: She later succeeded Shapley as director of the Harvard College Observatory.
NebulaRelated: Her work helped explain the stellar radiation that excites glowing nebular gas.