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American astronomer Edwin Hubble looks through the eyepiece of the 100-inch telescope at the Mount Wilson Observatory in Los Angeles, 1937. In 1929, Hubble proposed that the more distant a galaxy is, the faster it appears to be receding from us, a concept that has become known as Hubble's law. Margaret Bourke-White/Time & Life Pictures/Getty Images hide caption

toggle caption Margaret Bourke-White/Time & Life Pictures/Getty Images

Credit Controversy: Who Made Key Cosmos Discovery?

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