Edwin Hubble, an American astronomer was born on 20 November, 1889 in Marshfield, Missouri, United States, and died on 28 September, 1953 in San Marino, California, at 63 years of age. Hubble is known generally for the popular Hubble’s law. With the use of Hooker Telescope, (which was the biggest telescope in the world at that time back), he discovered Cepheid variables–a kind of star in various spiral nebulae, which includes the Triangulum and Andromeda Nebula. Edwin also came up with the system for the classification of galaxies, which is most commonly used, by grouping them as per their visual aspect in the photographic images. Thus he arranged the various galaxy groups.
Later on, they became famous as the Hubble sequence. In the twentieth century, he is considered as a leader in observational cosmology. He made the discovery that, besides the Milky Way, there are a number of other galaxies that exist.
