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Saul Perlmutter (born 1959, Champaign-Urbana, Illinois, U.S.) is an American physicist who was awarded the 2011 Nobel Prize for Physics for his discovery of dark energy, a repulsive force that is the dominant component (73 percent) of the universe. He shared the prize with astronomers Brian Schmidt and Adam Riess. Perlmutter graduated with a bachelor’s degree in physics from Harvard University in 1981, and he received a doctorate in physics from the University of California,...