How did the Big Bang theory originate?

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Georges Lemaître, a physicist and Belgian Catholic priest, set down one of the first modern propositions of the Big Bang theory for the origin of the universe. It was in 1927 that he published his "hypothesis of the primeval atom", which was based on Einstein's work.
Edwin Hubble came along in 1929 with the physical observations that the universe is expanding. This confirmed Lemaître's ideas. It turns out that far away objects are moving away from us quickly. And the farther away they are, the faster they're moving away. Other astronomers looked to see if they could see it in the so-called redshift (Doppler shift) in the retreating galaxies and other bright, distant objects. They could. Since the universe was expanding (and it was and still is according to all observations), the next logical step is to "rewind" the show all the way back to where the universe started expanding. Presto! Big Bang!
How did the Big Bang theory originate? That's it in a nutshell. Links are provided to the relevant Wikipedia articles on the Big Bang cosmological model.
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When did the Big Bang theory originate?

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