Thousands of black holes at Milky Way's centre: Study
Researchers studying data from NASA's Chandra X-ray Observatory have estimated that up to 10,000 black holes are present within 3 light-years of Sagittarius A*, a supermassive black hole at the centre of Milky Way galaxy. Sagittarius A* is 4 million times as heavy as the Sun and is located 26,000 light-years from the Earth.