Question

What did Georges Lemaître say about the Universe?

Answer 1

Georges Lemaître was an astronomer and professor of physics who is thought to be the first to have theorised that the universe is expanding.  

His theory was observationally confirmed soon afterwards by Edwin Hubble in what is now known as Hubble’s Law.  

Lemaître is also credited with proposing what has now become known as the Big Bang theory – which says that the observable universe began with an explosion of a single particle.

https://www.independent.co.uk/news/science/georges-lemaitre-priest-universe-expanding-big-bang-hubble-space-cosmic-egg-astronomer-physics-a8449926.html