Milky Way Bubbles
NASA’s Fermi has discovered two gamma ray bubbles on both sides of the Milky Way. Together, the are 50,000 light years long. These bubbles may be caused by the supermassive black hole at the center of our galaxy. “What we see are two gamma-ray-emitting bubbles that extend 25,000 light-years north and south of the galactic center,” said Doug Finkbeiner, an astronomer at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., who first recognized the feature. “We don’t fully understand their nature or origin.” These structures stretch from constellation Virgo to Grus and could be millions of years old.