Rubuta ci gaba ga wannan sakin layi - An yi la'akari da ilimin kimiyya na zamani na zamani a cikin 1917 tare da wallafe-wallafen Albert Einstein na gyaran karshe na ka'idar dangi a cikin takarda "Cosmological Considerations of the General Theory of Relativity" (ko da yake wannan takarda ba ta da yawa a waje da Jamus har zuwa karshen yakin duniya na). Ka'idar dangi ta sa masana kimiyyar sararin samaniya kamar su Willem de Sitter, Karl Schwarzschild, da Arthur Eddington su binciki tasirinsa na taurari, wanda ya inganta ikon masana taurari don nazarin abubuwa masu nisa. Masana kimiyyar lissafi sun fara canza zato cewa sararin samaniya ba ya canzawa. A shekara ta 1922 Alexander Friedmann ya gabatar da ra'ayin sararin samaniya mai fadadawa wanda ya ƙunshi abubuwa masu motsi. Kusan lokaci guda (1917 zuwa 1922) Babban Muhawarar
ya faru, tare da masana kimiyyar sararin samaniya na farko kamar Heber Curtis da Ernst Öpik sun ƙaddara cewa wasu nebulae da aka gani a cikin telescopes sun kasance galaxies daban-daban masu nisa daga namu.