When antiparticles meet particles, an explosion ensues that leads to the two types of matter cancelling each other out. These particles are called antiprotons and positrons (or antielectrons). Antimatter consists of particles that are essentially the same as visible matter particles but with opposite electrical charges. 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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