<prompt> Bhala okuqhubekayo kwalesi sigaba - Ngokushesha ama-Cephid atholakala kweminye imithala, njenge-Andromeda ikakhulukazi u-Edwin Hubble ngo-192324, futhi aba yingxenye ebalulekile yobufakazi bokuthi ama-nebulae angama-spiral ayi imithala ezimele etholakala kude ngaphandle komthala wethu i-Milky Way. Ngakho-ke, ukutholakala kukaLeavitt kwakuzoshintsha isithombe sethu sendawo yonke kuze kube phakade, njengoba kwashukumisela uHarlow Shapley ukuba asuse iLanga lethu enkabeni yomthala  <response>: no-Edwin Hubble ukuze asuse umthala wethu enkabeni yendawo yonke. 