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01/01/1925 Edwin Hubble finds that there are other galaxies in the universe

Edwin Powell Hubble, an American astronomer, provided evidence that the recessional velocity of a galaxy increases with its distance from the earth. He also discovered that many objects previously thought to be clouds of dust and gas and classified as "nebulae" were actually galaxies beyond the Milky Way.


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  • Accusations concerning Lemaître's priority 

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