Dark matter makes up about 80 percent of the universe's mass, but scientists still don't know what the strange stuff is. The hunt is on to find and characterize these exotic particles, from WIMPS to sterile neutrinos to axions. "The theory space for what dark matter might be is immense," Shunsaku Horiuchi, of the University of California-Irvine, said at a news conference at the April meeting of the American Physical Society in Savannah, Georgia. When the Big Bang created the universe 13.8 billion years ago, dark matter particles were produced along with the "normal" matter that we can see and touch.
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