Who first proposed the theory that the universe is expanding?
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The Belgian astronomer Georges Lemaître introduced the concept of an expanding universe in 1927, explaining the redshift observed in distant galaxies. While Edwin Hubble later provided crucial experimental evidence, confirming Lemaître's theory, Lemaître was the first to theorize it, even suggesting a 'primeval atom' as its origin.
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Source: Wikipedia (CC BY-SA)
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