AdvertisementCredit Controversy: Who Made Key Cosmos Discovery?03:51Download AudioResumeNovember 10, 2011Joe PalcafacebookEmailAmerican 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. (Time & Life Pictures/Getty Images)