<prompt> Pedzisa mutsara unotevera: Muna 1920 akagadzwa kuva mutungamiriri weAllegheny Observatory. Mugore rimwe chetero akapindawo mu  <response>: Great Debate naHarlow Shapley anonziwo Shapley-Curtis Debate pamusoro pechimiro chema nebulae nemapoka enyeredzi, uye kukura kwechisiko chose. Curtis akatsigira pfungwa yava kugamuchirwa iye zvino yokuti kune mamwe mapoka enyeredzi kunze kweGwara Renzou. 