Who Proposed the Theory?

Georges Lemaitre first proposed the idea of the Big Bang even thought he does not always get the credit for it. Some people believe that the credit should go to Edwin Hubble who first observed that the universe is continuously expanding. Others claim that Lemaitre first made the observations, but they went unnoticed until after Hubble published his report. These observations are ultimately what led to formulating the idea of a Big Bang. In 1931, Lemaitre explained his idea at a meeting of the British Association in London. At first, Einstein did not believe Lemaitre's idea, but after more research he eventually came around. Lemaitre ended up receiving many awards including the Francqui Prize, Eddington Medal, and was elected a member of the Pontifical Academy of Sciences. Around 1949 George Gamow took Lemaitre's abandoned idea and revised it. People today more commonly acknowledge George Gamow for formulating the Big Bang Theory. 
Pictures below from top to bottom
Georges Lemaitre and Albert Einstein
http://www.catholiceducation.org/en/science/faith-and-
science/a-day-without-yesterday-georges-lemaitre-amp-the-big-bang.html
George Gamow
http://totallyhistory.com/george-gamow/
Georges Lemaitre and Albert Einstein
George Gamow
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