Whakaotihia te rerenga kōrero e whai ake nei: I mua i te putanga mai o te mātauranga o te ao hou, he nui te kōrero e pā ana ki te rahi me te āhua o te ao nui. I te tau 1920,
Shapley<unk>Curtis i puta te tautohetohe i waenga i a Harlow Shapley me Heber D. Curtis mo tenei take. I tautohe a Shapley mo te ao iti e rite ana te rahi ki te Milky Way galaxy, a i tautohe a Curtis he nui ake te ao. I whakaotihia te take i roto i te tekau tau e whai ake nei me nga kitenga pai ake a Hubble.