A giant gamma-ray structure emerges by processing Fermi all-sky data at energies from 1 to 10 GeV. The dumbbell-shaped feature emerges from the galactic center and extends 50 degrees north and south from the plane of the Milky Way. A supermassive black hole weighing about 4 million times the sun's mass also lurks in the galactic center; these "gamma-ray bubbles" may have arisen as a result of a past eruption by the black hole or another source near the galactic center.
NASA/DOE/Fermi LAT/D. Finkbeiner, <i>et al</i>.
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