Ka cika wannan furcin: A daidai lokacin da ake wannan bincike mai zurfi game da sararin samaniya, an soma wata muhawara mai daɗewa game da yadda sararin samaniya ya kasance. Harlow Shapley, masanin astronomer na Mount Wilson, ya ba da shawarar samfurin sararin samaniya wanda ya kunshi tsarin tauraron Milky Way kawai; yayin da Heber D. Curtis ya yi jayayya da ra'ayin cewa nebulae masu juyawa sune tsarin tauraron kansu a matsayin tsibirin duniya. Wannan bambancin ra'ayi ya zo ne zuwa wani babban mataki tare da kungiyar na
Babban muhawara a ranar 26 ga Afrilu 1920 a taron Cibiyar Kimiyya ta Kasa ta Amurka a Washington, DC An warware muhawara lokacin da Edwin Hubble ya gano Cepheid Variables a cikin Galaxy Andromeda a cikin 1923 da 1924. Nesawarsu ta kafa nebulae mai juzu'i fiye da gefen Milky Way..