jan 192013
"Cosmic fog" of the Nearby Universe measured

  Researchers from the Laboratoire Leprince-Ringuet (CNRS/École Polytechnique) have carried out the first measurement of the intensity of the diffuse extragalactic background light (EBL) in the nearby Universe, a fog of photons that has filled the Universe ever since its formation. Using some of the brightest gamma-ray sources in the southern hemisphere, the study was [continue reading]

nov 052012
Fermi Measures Cosmic 'Fog' Produced by Ancient Starlight

  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. This plot shows the locations of 150 blazars (green dots) [continue reading]