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Particle Physics

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GAMMA GENERATOR  Gamma-ray emissions from the center of the Milky Way appear as colors other than purple in these images.. The panel at right shows that when emissions from known gamma-ray sources are removed, a strong signal about 10,000 light-years across remains. A team of physicists argues that dark matter particles are responsible for those gamma rays.

IN DEEP  Interspersed with the plot of Particle Fever are artful explanatory animations and commentary highlighting that the Higgs boson is a stepping stone toward a deeper understanding of the universe.

NORTH POLE  An artificial monopole (left), whose magnetic field spreads away in all directions, came from researchers’ manipulation of an ultracold gas. In a traditional bar magnet (right), the magnetic field juts out from the north pole and bends toward the south pole.

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