Georges Lemaître first noted in 1927 that an expanding universe could be traced back in time to an originating single point, which he called the "primeval atom". Edwin Hubble confirmed through analysis of galactic redshifts in 1929 that galaxies are indeed drifting apart; this is important observational evidence for an expanding universe. For several decades, the scientific community was divided between supporters of the Big Bang and the rival steady-state model. In 1964, the CMB was discovered, which was crucial evidence in favor of the hot Big Bang model, since that theory predicted a uniform background radiation throughout the universe. A wide range of empirical evidence strongly favors the Big Bang, which is now universally accepted.