100 years ago this week, Edwin Hubble announced his monumental discovery that the universe existed beyond our own Milky Way galaxy. He noted that the Andromeda nebula, also called M31, was nearly a million light years away – too remote to be a part of the Milky Way.

    https://carnegiescience.edu/news/carnegie-science-celebrates-edwin-hubbles-discovery-universe

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    1. The entire history of science is finding out that there’s so much more beyond what we can see