Rubuta ci gaba don wannan sakin layi - A cikin 1913, Ejnar Hertzsprung yayi ƙoƙarin neman nesa zuwa 13 Cepheids ta amfani da motsi ta sararin sama. Amma, daga baya ya bukaci a sake nazarin binciken da ya yi. A cikin 1918, Harlow Shapley ya yi amfani da Cepheids don sanya ƙuntatawa na farko akan girman da siffar Milky Way, da kuma sanyawar Rana a ciki. A cikin 1924, Edwin Hubble ya kafa nisa zuwa masu canjin Cepheid na gargajiya a cikin Galaxy na Andromeda, har sai da aka sani da "Andromeda" "Nebula", kuma ya nuna cewa masu canji ba membobin Milky Way bane. Gano Hubble ya warware tambayar da aka yi a cikin "Babban Muhawara
"ko dai Milky Way ya wakilci dukan duniya ko kuma daya daga cikin galaxies da yawa a duniya.