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EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Edwin Powell Hubble (1889-1953), US astronomer and cosmologist, using the 48-inch Schmidt camera at Palomar Observatory, California. In 1923, while using the 100-inch telescope at the Mount Wilson Observatory, California, Hubble observed Cepheid variable stars in the Andromeda nebula, proving it was a galaxy outside our own. He later introduced the classification system for galaxies. 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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