Edwin Hubble, US astronomer

Edwin Hubble, US astronomer

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Edwin Powell Hubble (1889-1953), US astronomer and cosmologist, using a telescope. In 1923, while using the 100-inch telescope at the Mount Wilson Observatory, where he worked for most of his life, Hubble observed Cepheid variable stars in the Andromeda nebula, proving it was a galaxy outside our own. He later introduced the classification of galaxies (spirals, barred spirals, ellipticals). In 1929, he announced Hubble's Law, that galaxies move apart faster the further away they are, key evidence for the expansion of the universe.

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