Lemaître Proposes Cosmic Expansion Theory

In 1927, Belgian physicist and Catholic priest Georges Lemaître published 'Un Univers homogène de masse constante et de rayon croissant' in the Annales de la Société Scientifique de Bruxelles. He developed the theory that Einstein's equations of general relativity implied an expanding universe rather than a static one. Lemaître mathematically demonstrated the relationship between galactic recession velocity and distance, predicting what became known as Hubble's Law. His work established the theoretical foundation for what later became called the Big Bang theory.