<prompt> Pedzisa mutsara unotevera: Pakurega basa kwaPickering muna 1921, Mutungamiriri weHCO akawira kuna Harlow Shapley mutori mukuru mune inonzi  <response>: Great Debate ra1920. Nguva iyi yokucherechedza yakakurumbira nebasa raCecelia Payne-Gaposchkin, uyo akava mukadzi wokutanga kuwana dhigirii rePh.D. muastronomy kubva kuRadcliffe College kufamba zvishoma kubva kuObservatory. Pfungwa yaPayne-Gapochkin ya1925 yakataura kuti nyeredzi dzainyanya kuumbwa nehydrogen nehelium, pfungwa yaifungidzirwa kuva isina musoro panguva iyoyo. Pakati penguva yaShapley uye kuumbwa kweCfA, nzvimbo yekucherechedza yakatungamirirwa naDonald H. Menzel uye ipapo Leo Goldberg, vose vari vaviri vakachengetedza mapurogiramu anozivikanwa zvikuru muzuva uye nyeredzi astrophysics. Menzel akaita basa guru mukukurudzira Smithsonian Astrophysical Observatory kuti iende kuCambridge uye kushanda pamwe chete neHCO. 