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Dec 21, 2017 at 1:27 comment added Jeff Well, this sort of detail is why I ask questions here, thanks.
Dec 20, 2017 at 23:34 comment added Conifold @Jeff Even Shapley did not claim that Milky Way was the entire universe, only that what was thought to be other observed galaxies wasn't, and the whole debate was rather narrowly centered on the status of novas and spiral nebulae. Multiple galaxies were already discussed in 17th and 18th century, and Hubble's confirmation in 1920-s was like Bessel's, too late to be too exciting. It was a "great debate" for academically inclined but not nearly as culturally consequential as say debates over evolution half a century earlier.
Dec 20, 2017 at 23:21 comment added Jeff Based on this, it seems like many until 1920 believed that the Milky Way was more or less the whole universe: en.wikipedia.org/wiki/Great_Debate_(astronomy) -- so wasn't the resolution of this debate significant in changing world view?
Dec 20, 2017 at 23:17 history answered Conifold CC BY-SA 3.0