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sep 15, 1923 - Edwin Hubble working at Mount Wilson Observatory (photo) and using a 60 inch reflector telescope proves that galaxies are separate systems outside of our own Milky Way and that the Universe was expanding.
Added to timeline:
9 Nov 2018
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Space Timeline Project
Kylie, Ryann, Alisha
Date:
sep 15, 1923
Now
~ 100 years ago