 Nyora kupfuurira kweiyi ndima - Muna 1920 akagadzwa kuva mutungamiriri weAllegheny Observatory. Mugore rimwe chetero akapinda muGreat DebatenaHarlow Shapley anonziwo ShapleyCurtis 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. 