Mysterious ancient structures and filaments discovered in Milky Way's center.
Astronomers have discovered hundreds of previously unknown "filaments" at the center of the Milky Way, each measuring between 5 and 10 light-years in length and visible only in radio wavelengths. These structures appear to point directly at the central supermassive black hole, Sagittarius A*, suggesting that they may be the unhealed scars of an ancient, high-energy black hole outburst that tore through the surrounding clouds of gas. The filaments were likely created by bursts of high-energy particles that are invisible to the naked eye, and may have been caused by an eruption of energy from the black hole around 6 million years ago.