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NASAs Fermi Closes on Source of Cosmic Rays
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NASA's Fermi Closes on Source of Cosmic Rays

January 10, 2013
Fermi's Large Area Telescope resolved GeV gamma rays from supernova remnants of different ages and in different environments. W51C, W44 and IC 443 are middle-aged remnants between 4,000 and 30,000 years old. Cassiopeia A, which is only 330 years old, appears as a point source. Credit: NASA/DOE/Fermi LAT Collaboration


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