Buuxi weedhan soo socota: Cepheids waxaa si dhakhso ah looga helay meerayaasha kale, sida Andromeda (gaar ahaan Edwin Hubble 1923<unk>24), waxayna noqdeen qayb muhiim ah oo ka mid ah caddaynta in "Nebulae-yada wareega" ay yihiin meerayaal madaxbannaan oo ku yaal meel ka baxsan Milky Way-gayaga. Hadaba, Leavitt waxa uu helay waxa uu weligiis badali lahaa aragtideena caalamka, maadaama uu ku dhiirigeliyay Harlow Shapley in uu ku wareejiyo qoraxdeena bartamaha galaxy-da "
"Dooda Weyn" iyo Edwin Hubble si ay u guuraan Galaxy dhexe ee caalamka.