Tuhia he whakamāramatanga mō tēnei wāhanga - I whakawhanakehia te ariā Big Bang mai i ngā kitenga o te hanganga o te ao whānui, mai i ngā whakaaro ariā. I te tau 1912, i whangangahia e Vesto Slipher te nekehanga Doppler tuatahi o te "nebula porohita" (ko te nebula porohita te kupu tawhito mo nga aorangi porohita), ana ka kitea e tata ana ki te katoa o aua nebula e neke atu ana i te Ao. Kāore ia i mārama ki ngā pānga ā-ao o tēnei meka, ā, i taua wā he tino tautohetohe
ahakoa he "motu ao" ēnei nebulae i waho o to tatou Milky Way. Tekau tau i muri mai, Alexander Friedmann, he Russian cosmologist me te kaikauwhau, i ahu mai i nga whārite Friedmann mai i nga whārite āpure Einstein, e whakaatu ana kei te whanui pea te ao i te rereketanga ki te tauira o te ao pumau i taunakitia e Albert Einstein i taua wa.