Edwin Powell Hubble (1889-1953) was an American astronomer, who discovered the existence of other galaxies outside our own, and classified them according to their shape. His theory that the universe is expanding is now generally accepted.
Born in Marshfield, Missouri, Hubble originally studied law before joining the Yerkes Observatory in 1914, subsequently moving to Mount Wilson where in 1923, he discovered that the class of variable stars known as Cepheids exist outside our own Galaxy.
In 1925 he introduced the classification of galaxies as spirals, barred spirals and ellipticals.
In 1929 he announced Hobble's law, that is, that the galaxies are moving apart at a rate that increases with their distance.
Why is Edwin Hubble famous?
Edwin Hubble was an American astronomer who profoundly changed the understanding of the universe.