An unexpectedly bright glow of gamma rays at the center of the Milky Way may be the signature of suicidal dark matter, according to an analysis reported April 6. Dark matter dominates the mass of galaxies, including our own, but its composition remains a mystery. Many theorists think that dark matter comes in the form of particles that annihilate each other and release energy when they collide. If that's the case, then galaxies should emit large amounts of high-energy gamma radiation, particularly at their centers where the density of dark matter is greatest.
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