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Edwin Hubble was an American astronomer who played a crucial role in establishing the fields of extragalactic astronomy and observational cosmology.
* He was born in Marshfield, Missouri, in 1889 and died in San Marino, California, in 1953.
* Hubble studied at the University of Chicago and the University of Oxford.
* He worked at the Mount Wilson Observatory from 1919 to 1953.
* In 1923, Hubble proved that the Andromeda Nebula was a galaxy outside of the Milky Way.
* He also discovered that the universe is expanding.
* Hubble's work has had a profound impact on our understanding of the universe.
* He is considered one of the most important astronomers of the 20th century.

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