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In The Heart Of Cygnus NASAs Fermi Reveals A Cosmic-ray
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In The Heart Of Cygnus, NASA's Fermi Reveals A Cosmic-ray Cocoon

January 11, 2013
Gamma-ray emission detected by Fermi LAT fills bubbles of hot gas created by the most massive stars in Cygnus X. The turbulence and shock waves produced by these stars make it more difficult for high-energy cosmic rays to traverse the region. When the particles strike gas nuclei or photons of starlight, gamma rays result. Credit: NASA/DOE/Fermi LAT Collaboration/I. A. Grenier and L. Tibaldo