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Belgian priest and astronomer Georges Lemaître was the first person to propose a theory of the expansion of the Universe, which became known as the Big Bang theory.

en.wikipedia.org/wiki/History_of_the_Big_Bang_theory

The history of the Big Bang theory began with the Big Bang's development from observations .... One was Lemaître's Big Bang, advocated and developed by George Gamow. The other model was Fred Hoyle's Steady State theory, in which new ...

en.wikipedia.org/wiki/Georges_Lema%C3%AEtre

Georges Henri Joseph Édouard Lemaître Associate RAS was a Belgian Catholic Priest, ... Lemaître also proposed what became known as the Big Bang theory of the origin of the universe, which he called his "hypothesis of the primeval atom" ...

www.nationalgeographic.com/science/space/universe/origins-of-the-universe

Learn about the big bang theory and how our universe got started. ... The most popular theory of our universe's origin centers on a cosmic cataclysm unmatched  ...

www.space.com/25126-big-bang-theory.html

Jun 12, 2017 ... The Big Bang Theory is the leading explanation about how the universe ... the free electrons met up with nuclei and created neutral atoms.

phys.org/news/2015-12-big-theory.html

Dec 18, 2015 ... How was our Universe created? How did it come to be the seemingly infinite place we know of today? And what will become of it, ages from ...

www.physicsoftheuniverse.com/scientists_lemaitre.html

... to become known as the Big Bang theory of the origin of the universe, which Lemaître himself called his “hypothesis of the primeval atom” or the “Cosmic Egg” .

news.wgbh.org/post/big-bang-theory-roman-catholic-creation

Mar 20, 2014 ... And if you dig into its origins, you come across a curious fact. ... for this: The Big Bang theory was first proposed by a Roman Catholic priest.

www.big-bang-theory.com

Big Bang Theory - Concise synopsis of the big bang theory's background, historical foundations, ... What are the alternatives to our ultimate question of origins?

umich.edu/~gs265/bigbang.htm

The origin of the Big Bang theory can be credited to Edwin Hubble. Hubble made the observation that the universe is continuously expanding. He discovered ...