Lemaître's Big Bang Theory

Lemaître's Big Bang Theory proposes that the universe originated from an extremely hot, dense state around 13.8 billion years ago. It suggests that all space, matter, and energy were concentrated in a tiny point, which then began expanding rapidly. This expansion explains why galaxies are moving away from each other and their distances increase over time. Over billions of years, the universe cooled and matter formed stars, planets, and galaxies. Lemaître's idea was a pioneering step in understanding cosmic origins, emphasizing that the universe has been evolving and expanding since its initial sudden expansion.