TIL that until the early 1920s, most astronomers thought that the Milky Way contained all the stars in the Universe

Read more: https://en.wikipedia.org/wiki/Milky_Way

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  1. Before Edwin Hubble was able to measure the distance to nebulae in 1920, no one could determine if a nebula was within the Milky Way or outside of it.

    That doesn’t necessarily mean that astronomers thought that the Milky Way contained everything though. They just didn’t have any way to prove otherwise.

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