Belching black hole proves a biggie: First known 'middleweight' black hole
Monday, July 9, 2012 - 11:01
in Astronomy & Space
Astronomers have found the first known "middleweight" black hole. Before it was found, astronomers had good evidence for only supermassive black holes -- ones a million to a billion times the mass of the Sun -- and "stellar mass" ones, three to thirty times the mass of the Sun.