Monday, November 5, 2012

Fermi Measures Cosmic 'Fog' From Ancient Starlight


This plot shows the locations of 150 blazars (green dots) used in the EBL study. Credit: NASA.

Astronomers using data from NASA's Fermi Gamma-ray Space Telescope have made the most accurate measurement of starlight in the universe and used it to establish the total amount of light from all of the stars that have ever shone, accomplishing a primary mission goal. 

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