16 Feb Black holes don't just sit there munching away constantly on the space around them. Eventually they run out of nearby matter and go quiet. 4 Apr The Milky Way's central supermassive black hole is surrounded by an entourage of smaller black holes. For the first time, this cosmic posse has. 28 Sep two colliding black holes for the fourth time – and the shape of its ripples sent through spacetime for the first. The announcement was made at.