Gamma rays set to stun: Mystery of the two gigantic 'beams' that blasted out of the heart of the Milky Way a million years ago

'The faint jets we see today are a ghost or after-image of what existed a million years ago,' said Meng Su, an astronomer at the Harvard-Smithsonian Center for Astrophysics, after the Fermi Space Telescope detected traces of the blasts.

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