Who was Georges LemaÃ®tre, founder of modern Big Bang theory?
Born on July 17, 1894, Belgian astronomer Georges LemaÃ®tre is regarded as the founder of the modern Big Bang theory, which says the observable universe began with an explosion of a single particle. Based on Einstein's theory of general relativity, LemaÃ®tre also proposed the universe is expanding, which was observationally confirmed in 1929 by Edwin Hubble and named Hubble's Law.