Assignment task:
Cecelia Payne Gaposhkin's (1900-1979) vast work with stellar spectra at Harvard's observatory lead to Question Select one: a. her hypothesis - later confirmed to be true - that stars' atmospheres are made mostly of hydrogen and helium b. her deriving a conversion scale to determine stars' temperatures from the spectroscopic data collected at Harvard's observatory c. demonstration that Annie Jump Cannon's newer re-organization (OBAFGKM) of the earlier spectral classification system for stars also organized the star types in order of highest to lowest temperatures d. the publication of her PhD dissertation in 1925, which was described as the 'best PhD thesis ever written in astronomy' e. All of these. f. her being the first woman promoted to full professor and chair of a department at Harvard, in 1956.