<prompt> Bhala okuqhubekayo kwalesi sigaba - Ngaphambi kokuvela kwe - cosmology yanamuhla, kwakukhulunywa kakhulu ngosayizi nokuma kwendawo yonke. Ngo-1920, impikiswano kaShapley noCurtis  <response>: kwenzeka phakathi kukaHarlow Shapley noHeber D. Curtis ngalolu daba. UShapley wagomela ngokuthi indawo yonke incane ngangomthala iMilky Way, kanti uCurtis wagomela ngokuthi indawo yonke inkulu kakhulu. Le nkinga yaxazululwa eminyakeni eyishumi eyalandela ngokuthuthukiswa kokubuka kweHubble. 