Georges Lemaître is well - known for proposing the Big Bang theory. He used scientific observations and mathematical models to come up with the idea that the universe started from a single point and then expanded. Fred Hoyle, on the other hand, proposed the Steady State theory. But as scientific research progressed and more evidence like the expansion of the universe became clear, the Big Bang theory became the dominant view in the study of the universe origin story.
Georges Lemaître proposed the Big Bang theory. He was a Belgian priest and physicist. His theory was revolutionary as it provided a scientific explanation for the origin of the universe. Fred Hoyle was known for the Steady State theory. However, over time, as more evidence emerged, especially things like the discovery of the cosmic microwave background radiation, the Big Bang theory proposed by Lemaître became the more widely accepted one.