Who first proposed that milky way was not the entire universe in the 18th century?
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Dec. 30, 1924: Hubble Reveals We Are Not Alone. 1924: Astronomer Edwin Hubble announces that the spiral nebula Andromeda is actually a galaxy and that the Milky Way is just one of many galaxies in the universe. Before Copernicus and Galileo, humans thought our world was the center of creation.
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