<prompt> Bhala ukuqhubeka kwalesi sigaba - Ngo - 1920, iNgxoxo Enkulu  <response>: phakathi kukaHarlow Shapley noCurtis okwenzeka ngokuphathelene nemvelo yeMilky Way, ama-nebula e-spiral, kanye nobukhulu bendawo yonke. Ukuze asekele isimangalo sakhe sokuthi i-Great Andromeda Nebula empeleni, iyinkanyezi engaphandle, uCurtis waphawula nokuvela kwemizila emnyama ngaphakathi kwe-Andromeda efana namafu othuli emthaleni wethu, kanye nokuqashelwa komlando kokuguqulwa okuphawulekayo kwe-Doppler kwe-Andromeda Galaxy. Ngo-1922 u-Ernst Öpik wethula indlela yokulinganisa ibanga le - Andromeda esebenzisa isivinini sezinkanyezi ezilinganisiwe. Umphumela wakhe wabeka i-Andromeda Nebula kude ngaphandle komthala wethu ebangeni elingamakhilomitha angaba ngu. U-Edwin Hubble waxazulula le mpikiswano ngo-1925 lapho eqala ngqa ukuthola izinkanyezi eziguquguqukayo zama-Cepheid ezingaphandle komthala ezithombeni zezinkanyezi ze-Andromeda. Lokhu kwenziwa kusetshenziswa isibonakude sikaHooker, futhi kwavumela ukuba kutholakale ibanga le-Great Andromeda Nebula. Ukulinganisa kwakhe kwabonisa ngokucacile ukuthi lesi sici sasingeyona inqwaba yezinkanyezi negesi ngaphakathi komthala wethu, kodwa kwakuwumthala ohlukile ngokuphelele owawukude kakhulu nomthala i-Milky Way. 