<prompt> Nyora kupfuurira kweiyi ndima - Muna 1917, Heber Curtis akanga aona nova S Andromedae mukati meGreat Andromeda Nebula Messier chinhu 31. Achitsvaka muzvinyorwa zvemifananidzo, akawana mamwe mapoka mapfumbamwe. Curtis akacherechedza kuti idzi nova dzaiva, paavhareji, dzakapfava zvikuru ne10 pane idzo dzakaitika mukati meMilky Way. Somugumisiro, akakwanisa kusvika pakufungidzira chinhambwe chemaparsek 150 000. Akava mutsigiri wefungidziro yezvitsuwa zvenyika yose, iyo yaitaura kuti nebulae dzinotenderera dzaiva mapoka enyeredzi akazvimirira. Muna 1920 Kurukurirano Huru  <response>: kwakaitika pakati paHarlow Shapley naHeber Curtis, pamusoro pechimiro cheMilky Way, spiral nebulae, uye ukuru hweZvakasikwa. Kuti atsigire kutaura kwake kwokuti Great Andromeda Nebula igwara renzou rokunze, Curtis akacherechedza kuoneka kwemigwagwa yakasviba yakafanana namakore eguruva muMilky Way, pamwe chete nokuchinja kunokosha kwaDoppler. 