<prompt> Bhala ukuqhubeka kwalesi sigaba - uShapley wabamba iqhaza KweDebate Enkulu  <response>: noHeber D. Curtis ngemvelo yama-nebula nemithala kanye nosayizi wendawo yonke. Le mpikiswano yenzeka ngo-April 26, 1920, ehholo le-United States National Academy of Sciences eWashington DC. UShapley wathatha uhlangothi lokuthi ama - spiral nebulae manje abizwa ngokuthi imithala angaphakathi komthala wethu i - Milky Way, kuyilapho uCurtis ethatha uhlangothi lokuthi ama - spiral nebulae ayizindawo eziseziqhingini ezingaphandle komthala wethu i - Milky Way futhi ezingalingana ngobukhulu nangokwemvelo nomthala wethu i - Milky Way. Lolu daba kanye nempikiswano kuyisiqalo sezinkanyezi ezingaphandle komthala, kuyilapho izimpikiswano ezinemininingwane nedatha, ngokuvamile enokungaqondakali, yavela ndawonye ngo-1921. 