<prompt> Qedela lo musho olandelayo: Ngo-1920 wamiswa njengomqondisi we-Allegheny Observatory. Ngawo lowo nyaka wabamba iqhaza  <response>: I-Great Debate noHarlow Shapley ebizwa nangokuthi i-Shapley-Curtis Debate ngesimo sama-nebula nemithala, kanye nosayizi wendawo yonke. UCurtis wayemelela umbono osamukelwayo manje wokuthi kwakukhona neminye imithala ngaphandle koMzila Wobisi. 