<prompt> Qedela lo musho olandelayo: Ngo-1920,  <response>: iNgxoxo-mpikiswano Enkulu phakathi kukaHarlow Shapley noCurtis yenzeka, ngokuphathelene nemvelo yeMilky Way, ama-nebula e-spiral, kanye nobukhulu beNdawo Yonke. Ukuze asekele isimangalo sakhe sokuthi i-Great Andromeda Nebula M31 yayiwumthala wangaphandle, uCurtis waphawula nokubonakala kwemigqa emnyama efana namafu othuli emthaleni wethu, kanye nokuguqulwa okuphawulekayo kweDoppler. Ngo-1922 u-Ernst Öpik wethula indlela enhle nelula ye-astrophysical yokulinganisa ibanga le-M31. Umphumela wakhe wafaka i-Andromeda Nebula kude ngaphandle komthala wethu ebangeni elingama-parsec angaba ngu-450 000, okuyi-ly engaba ngu-1 500 000. U-Edwin Hubble waxazulula impikiswano mayelana nokuthi akhona yini amanye imithala ngo-1925 lapho eqala ukubona izinkanyezi eziguquguqukayo ze-Cephid ezingaphandle komthala ezithombeni zezinkanyezi ze-M31. Lezi zenziwa kusetshenziswa isibonakude sikaHooker esingamamitha angu - 2,5 100 in, futhi zavumela 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 wethu. Lokhu kwafakazela ukuba khona kweminye imithala. 