<prompt> Qedela umusho olandelayo: Ngemva kokuthatha umhlalaphansi kukaPickering ngo-1921, ubuqondisi be-HCO bawela kuHarlow Shapley umhlanganyeli omkhulu kulokho okubizwa ngokuthi  <response>: Inkulumompikiswano Enkulu yango-1920. Le nkathi yesibhakabhaka yaduma ngomsebenzi kaCecelia Payne-Gaposchkin, owaba ngowesifazane wokuqala ukuthola i-PhD ku-astronomy eRadcliffe College okuhamba ibanga elifushane ukusuka eSibhakabhakeni. I-thesis kaPayne-Gapochkin yango-1925 yathi izinkanyezi zakhiwe ngokuyinhloko i-hydrogen ne-helium, umqondo owawubhekwa njengongenangqondo ngaleso sikhathi. Phakathi nesikhathi sokusebenza kukaShapley nokwakhiwa kweCfA, i-observatory yayiqondiswa nguDonald H. Menzel bese kuba nguLeo Goldberg, bobabili abagcina izinhlelo ezaziwa kabanzi kwi-solar and stellar astrophysics. UMenzel waba nendima enkulu ekukhuthazeni iSmithsonian Astrophysical Observatory ukuba ithuthele eCambridge futhi isebenzisane kakhulu ne-HCO. 