Georges Lemaitre

Georges Henri Joseph Édouard Lemaître (French: Georges Henri Joseph Édouard Lemaître, French pronunciation: [ʒɔʁʒ ɑʁi ʒozɛf edwaʁ ləmɛtʁ]; July 17, 1894 – June 20, 1966) was a Belgian born in Charleroi, Belgium, and died in Leuven. Roman Catholic priest, mathematician, astrophysicist, and professor of physics at the Catholic University of Leuven. In "The Hypothesis of the Primitive Atom", he first proposed the theory of the Big Bang origin of the universe, pointed out that the cosmological red shift can be explained by the expansion of the universe, and estimated the Hubble constant in 1927. This theory was later confirmed by Edwin Hubble's observations, so the related discovery was previously named Hubble's law until the International Astronomical Union voted to change it to Hubble-Lemaître's law in October 2018 to commemorate Lemaître's contribution.