While finishing his doctoral degree, he was invited to join the staff of the Mount Wilson Observatory. It was an invitation he had to declined because World War I had started and he had enlisted in the infantry.
In 1919, he returned and immediately went to the Mount Wilson Observatory. From this lonely mountain top in California, he made discoveries that brought a better understanding of the universe to the world. In 1923, he proved that the universe extended beyond the egde of the Milky Way. In 1925, he created a scheme for classifying galaxies. using the galactic period-luminosity relationship, he was able to determine distances. In 1929, he proved the universe is expanding. In 1936, he published The Realm of the Nebulae which became a popular success. Hubble continued to research at Mount Wilson and Palomar until his death on September 28, 1953 of a cerebral thrombosis.
Designed by: Sheryl Martin.
Christianson, G. E. Edwin Hubble: Mariner of the Nebluae. New York: Farrar, Straus, and Giroux, 1995.
Mayall, N.U. "Edwin Hubble."
http://antwrp.gsfc.nasa.gov/diamond_jubilee/d_1996/hubble_nas.html.
Sandage, A. "Edwin Hubble 1889-1953." J. Roy. Astoc. Soc Canada
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http://antwrp.gsfc.nasa.gov/diamond_jubilee/d_1996/sandage_hubble.html