Holes together

时间:2019-03-08 08:06:17166网络整理admin

ASTRONOMERS have spotted several “middleweight” black holes that they believe formed when others coalesced. Black holes usually come in two varieties—supermassive ones created when huge gas clouds collapse, and much smaller black holes born in supernovae. But at a meeting of the American Astrophysical Society in Charleston last week, astronomers from NASA and Carnegie Mellon University in Pittsburgh announced the discovery of medium-sized black holes. These middleweights have a mass equivalent to several hundred Suns, and the researchers rule out supernovae or collapsing gas clouds as their source. “The most viable theory is that a lot of stellar-size masses merge to create an intermediate mass range black hole,