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A newly-discovered structure, which spans 50,000 light-years and is positioned in the center of the Milky Way, was identified by NASA's Fermi Gamma-ray Space Telescope.
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"What we see are two gamma-ray-emitting bubbles that extend 25,000 light-years north and south of the galactic center," said Finkbeiner. "We don't fully understand their nature or origin."