Shapley wuxuu ka qeyb qaatay "Dood Weyn"
" Heber D. Curtis oo ku saabsan dabeecadaha Nebula iyo Galaksiyada iyo baaxada Caalamka. Dooddu waxay dhacday Abriil 26, 1920, hoolka Akadeemiyada Qaranka ee Sayniska ee Mareykanka ee Washington DC. Shapley wuxuu qaatay dhinaca in nebula spiral (waxa hadda loo yaqaan galaxies) ay ku jiraan gudaha Milky Way, halka Curtis uu qaatay dhinaca in nebula spiral ay yihiin 'universes jasiirad' meel ka baxsan Milky Way-da oo la barbardhigi karo cabirka iyo dabeecadda Milky Way-da. Arrintan iyo doodaan waa bilowgii cilmiga xiddigiska ee ka baxsan meeraha, halka doodaha iyo xogta faahfaahsan, inta badan oo aan caddayn, ay wada muuqdeen 1921.