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NASAS Fermi Measures Cosmic Fog Produced by Ancient
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NASA'S Fermi Measures Cosmic 'Fog' Produced by Ancient Starlight

January 11, 2013
Fermi measured the amount of gamma-ray absorption in blazar spectra produced by ultraviolet and visible starlight at three different epochs in the history of the universe. (Credit: NASA's Goddard Space Flight Center)


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