History of Science - Edwin Hubble

Edwin Hubble (November 20, 1889-September 28, 1953) was an American astronomer who played a crucial role in establishing the field of extragalactic astronomy and is generally regarded as one of the most important observational cosmologists of the 20th century. Hubble is known for showing that the recessional velocity of a galaxy increases with its distance from the earth, implying the universe is expanding. Edwin Hubble is also known for providing substantial evidence that many objects then classified as were actually galaxies beyond the Milky Way.