<< Astronomers (..) have studied how dark matter in clusters of galaxies behaves when the clusters collide. >>
<< (..) dark matter interacts with itself even less than previously thought >>
http://www.spacetelescope.org/news/heic1506/
David Harvey, Richard Massey, et al. The nongravitational interactions of dark matter in colliding galaxy clusters. Science, 27 March 2015: 1462-1465
http://dx.doi.org/10.1126/science.1261381
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