Buuxi weedha soo socota: Sanadkii 1913, Ejnar Hertzsprung wuxuu isku dayay inuu helo masaafada u dhaxaysa 13 Cepheids isagoo adeegsanaya dhaqdhaqaaqa cirka. Si kastaba ha ahaatee, cilmi-baaristiisa dambe waxay u baahnayd dib-u-eegis. Sanadkii 1918, Harlow Shapley wuxuu adeegsaday Cepheids si uu u dejiyo xaddidaadyo bilow ah oo ku saabsan cabirka iyo qaabka Milky Way, iyo meelaynta Qorraxdeena dhexdeeda. Sannadkii 1924, Edwin Hubble wuxuu aasaasay masaafada u dhaxaysa isbeddelada Cepheid ee caadiga ah ee Galaxy Andromeda, ilaa markaas loo yaqaan "Andromeda" "Nebula", wuxuuna muujiyey in isbeddelada aysan ka tirsanayn Milky Way. Hubble waxa uu xaliyay su'aashii ka taagnayd "
Dooda weyn" ee ah in Milky Way ay mataleyso caalamka oo dhan ama ay tahay mid ka mid ah galaxyada badan ee caalamka.