<prompt> Pedzisa mashoko anotevera: Dzidziso yeBig Bang yakatanga nokucherechedza masikirwo akaitwa zvinhu zvose uye nokufunga zvine chokuita nedzidziso. Muna 1912, Vesto Slipher akayera Doppler shift yokutanga yespiral nebula spiral nebula izita risingachashandi remapoka enyeredzi, uye nokukurumidza akawana kuti anenge mapoka enyeredzi ose akadaro akanga achienda kure nePasi. Haana kunzwisisa zvinorehwa nechinoitika ichi, uye zvirokwazvo panguva yacho  <response>: kunopokanwa zvikuru kana aya mabhabhurosi akanga ari zvitsuwa zvenyika yose kunze kweMilky Way yedu. Makore gumi gare gare, Alexander Friedmann, nyanzvi yezvomuchadenga yokuRussia uye nyanzvi yemasvomhu, akawana kuenzanisa kwaFriedmann kubva kuenzanisa kwemunda kwaEinstein, achiratidza kuti chisiko chapose pose chingave chichiwedzera mukupesana nomuenzaniso wechisiko chapose pose wakasimudzirwa naAlbert Einstein panguva iyoyo. 