who proposed the big bang theory

The Big Bang theory was first proposed by the Belgian priest, physicist, and astronomer Georges Lemaître in the late 1920s.

Quick Scoop

• Lemaître introduced the idea that the universe began from a single, extremely dense and hot state, which he called the “primeval atom.”

• He published his expanding-universe model in 1927, linking galaxy recession (what we now call Hubble’s law) to this cosmic origin.

• The familiar name “Big Bang” came later; it was coined by astronomer Fred Hoyle during a 1949 radio broadcast, originally as a somewhat dismissive label.

• Physicist George Gamow and others in the 1940s–1950s developed the theory further, especially the idea of element formation in the early, hot universe.

• Observations such as galaxy redshifts and the cosmic microwave background eventually turned Lemaître’s proposal into the standard model of cosmic beginnings.

In short: Georges Lemaître is the person credited with proposing the Big Bang theory, while later scientists refined, named, and confirmed it.

TL;DR: Who proposed the Big Bang theory? Georges Lemaître, in 1927.

Information gathered from public forums or data available on the internet and portrayed here.