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Sources

"Edwin Powell Hubble ." Edwin Hubble Biography Pt.1. N.p., n.d. Web. 25 Feb. 2014. .

"Edwin Powell Hubble." Biography. N.p., n.d. Web. 25 Feb. 2014. .

"1929: Edwin Hubble Discovers the Universe Is Expanding." Everyday Cosmology. N.p., n.d. Web. 25 Feb. 2014. .

"Expanding Universe." Hubble Law and the Expanding Universe. N.p., n.d. Web. 25 Feb. 2014. .

Fox, Mary Virginia. Edwin Hubble: American Astronomer. New York: Franklin Watts, 1997. Print.

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Edwin Hubble

By Marta