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Chronology of the universe. (n.d.). In Wikipedia. Retrieved July 1, 2017 from https://en.wikipedia.org/wiki/Chronology_of_the_universe

R. (2011, March 21). Day, night to be equal Monday. Retrieved June 18, 2017 from Redd, N.T. (2016, July 12).

Einstein’s Theory of General Relativity. Retreated July 5, 2017 from https://www.space.com/17661-theory-general-relativity.html