<prompt> Qedela le nkulumo elandelayo: Ngesikhathi esifanayo nalokhu kushintsha kwendlela yokufunda indawo yonke, impikiswano endala ngesakhiwo sendawo yonke yayifinyelela umvuthwandaba. Isazi sezinkanyezi saseMount Wilson uHarlow Shapley wasekela imodeli yendawo yonke eyakhiwe ngohlelo lwezinkanyezi lweMilky Way kuphela; kuyilapho uHeber D. Curtis ephikisana nomqondo wokuthi ama-spiral nebula ayeyizinhlelo zezinkanyezi ngokwazo njengeziqhingi zomhlaba. Lokhu kwehluka kwemibono kwafinyelela umvuthwandaba ngokuhlelwa kwe-  <response>: Impikiswano Enkulu ngomhlaka 26 Ephreli 1920 emhlanganweni we-U.S. National Academy of Sciences eWashington, D.C. Impikiswano yaxazululwa lapho u-Edwin Hubble ethola izinto eziguquguqukayo ze-Cephid ku-Andromeda Galaxy ngo-1923 nango-1924. Ibanga lazo lakha ama-nebula e-spiral ngale komngcele we-Milky Way. 