Ku dhammaystir weedha soo socota: Shapley wuxuu ka qayb qaatay "
Dood Weyn" oo uu la yeeshay Heber D. Curtis oo ku saabsan dabeecadda nebula iyo galaxiyada iyo baaxadda 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.