<prompt> Pedzisa mutsara unotevera: Muna 1920 gakava rakaitika pakati paHarlow Shapley naHeber Curtis  <response>: Gakava Guru, pamusoro pechimiro cheMilky Way, nebulae dzinotenderera, uye kukura kwechisiko chose. 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. 