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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
This illustration places the Fermi measurements in perspective with other well-known features of cosmic history. Star formation reached a peak when the universe was about 3 billion years old and has been declining ever since. (Credit: NASA's Goddard Space Flight Center)