Umthalakazi omakhophelana
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Umthalakazi omakhophelana uhlobo lomthalakazi onesimo esikhophelene. Uluhlobo oluyingxenye yezinhlobo ezintathu eziyinhloko zemithalakazi echazwe ngu -Edwin Hubble ochungechungeni lwakhe lwe-Hubble kanye nomsebenzi ka-1936 i-The Realm of the Nebulae, kanye nemithalakazi eyingoqelal kanye nogungubele . Imithalakazi emakhophelana (E), kanye nemithala egungubele (S0) enezinkatha diski zayo ezikulu, kanye nemithalakazi ye-ES enezinkatha zayo zomlinganiso ophakathi, ziyingxenye engaphansi yemithalakazi "yohlobo lokuqala".