"(Nat. Geo. July 5, 2012) There's a strange new brute on the celestial block—the middleweight black hole, a new study says.
After nearly three years of spying a superbright object nearly 300 million light-years away, astronomers with NASA's Chandra X-ray Observatory and SWIFT telescope recently announced the discovery of HLX-1, the first representative of a new type of black hole.
Until recently, black holes were thought to come in only two sizes: Small stellar varieties that are several times heavier than our sun, and supermassive black holes that pack the gravitational punch of many million suns—large enough to swallow our entire solar system.
Notorious for ripping apart and swallowing stars, extra-large black holes live exclusively in the hearts of most galaxies, including our own Milky Way.
The new middleweight black hole is between these two types—equal to the matter of about 90,000 suns..."