Why is Edwin Hubble famous for?

Edwin Hubble is famous for his groundbreaking work in astronomy, particularly for demonstrating that the universe is expanding. In the 1920s, he discovered a correlation between the distance of galaxies and their redshift, leading to Hubble's Law. This finding provided strong evidence for the Big Bang theory and revolutionized our understanding of the cosmos. Additionally, his work helped establish the field of extragalactic astronomy.