Fermi Finds the Farthest Blazars (VIDEO)

NASA/Goddard Space Flight Center

Caption

NASA's Fermi Gamma-ray Space Telescope has discovered the five most distant gamma-ray blazars yet known. The light detected by Fermi left these galaxies by the time the universe was two billion years old. Two of these galaxies harbor billion-solar-mass black holes that challenge current ideas about how quickly such monsters could grow.

Credit

NASA's Goddard Space Flight Center/Scott Wiessinger, producer

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