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Last updated on April 16, 2014 at 17:28 EDT

Tiny Galaxies Help Fermi Address a Big Mystery

April 9, 2012

No one knows what dark matter is, but it constitutes 80 percent of the matter in our universe. By studying numerous dwarf galaxies — satellite systems that orbit our own Milky Way galaxy — NASA’s Fermi Gamma-ray Space Telescope has produced some of the strongest limits yet on the nature of the hypothetical particles suspected of making up dark matter.  credit:  NASA