There is also such a thing as antimatter, which is not the same as dark matter. The smaller neutral axion and the uncharged photinos - both theoretical particles - are also potential placeholders for dark matter. "One of the outstanding questions is whether there is a pattern to the fractions that go into each neutrino species," Tyce DeYoung, an associate professor of physics and astronomy at Michigan State University and a collaborator on the IceCube neutrino observatory in Antarctica, told. The sterile neutrino would only interact with regular matter through gravity.
There are three known types of neutrinos a fourth, the sterile neutrino, is proposed as a dark matter candidate.
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