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M82 Sheds Light on Longstanding Cosmic Ray Mystery Posted by Guy Pirro on 11/3/2009 2:28 PM Scientists from the University of Delaware have discovered very high energy gamma rays in the Cigar Galaxy (M82), a bright galaxy filled with exploding stars 12 million light years from Earth. The gamma rays observed by the team have energies more than a trillion times higher than the energy of visible light and are the highest-energy photons ever detected from a galaxy undergoing large amounts of star formation. The findings provide strong evidence that exploding stars are the origin of the cosmic rays that bombard our atmosphere. | Read full story |

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