Hubble data has also advanced scientific ideas about the nature of dark matter and dark energy. Search for Dark Matter Will the universe keep expanding until all the heat energy of the cosmos is reduced to rubble? Or is there sufficient matter in the universe to force a reversal of the big bang expansion? That is to say, at some point, will the universe begin to contract? This would lead to a “big crunch.” The answer is unknown. About ninety-five percent of the universe is composed of dark matter (twenty-five percent) and dark energy (seventy percent). Dark matter adds gravity to the visible universe. Dark energy repels gravity over the universe as a whole. Thus, it’s possible that the combined effects of dark matter and dark energy may be sufficient to produce a big crunch. References Andrews, Evan. “10 Innovations that Built Ancient Rome.” A+E Networks, November 20, 2012. Retrieved May 16, 2018, from - that-built-ancient-rome Briney, Amanda. “A Brief History of the Age of Exploration.” ThoughtCo., last updated August 19, 2017. Retrieved May 16, 2018, from - 1435006 Cartwright, Mark. “Aztec Civilization.” Ancient History Encyclopedia, February 26, 2014. Retrieved May 16, 2018, from Cartwright, Mark. “Inca Civilization.” Ancient History Encyclopedia, September 15, 2014. Retrieved May 16, 2018, from Crossman, A. “What Are the Differences Between Folkways, Mores, Taboos, and Laws?” Last updated August 11, 2017. Retrieved May 16, 2018, from Engelman, Ryan. “The Second Industrial Revolution, 1870-1914.” U.S. History Scene, April 10, 2015. Retrieved May 16, 2018, from - revolution/ Gosling, F.G. “The Manhattan Project--Its Story.” Excerpt from The Manhattan Project: Making the Atomic Bomb . R&D, Department of Energy, last modified December 19, 2016.
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