NASA's Fermi Gamma-ray Space Telescope has unveiled a previously unseen structure centred in the Milky Way. The feature spans 50,000 light-years and may be the remnant of an eruption from a supersized black hole at the centre of our galaxy. "What we see are two gamma-ray-emitting bubbles that extend 25,000 light-years north and south of the galactic centre," said Doug Finkbeiner, an astronomer at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts, who first recognised the feature. "We don't fully understand their nature or origin..."
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