Astronomers think they have found a rare if not unique black hole very near the center of the Milky Way. That would make two of the beasts in that part of the galaxy.Or, for Americans, Regular, Large and Family.
The discovery also adds weight to the idea that black holes come in three sizes, essentially small, medium and large.
Stellar black holes -- the remains of collapsed stars, are common. They typically harbor as much mass as a few suns. And for years, scientists have known there are supermassive black holes in many galaxies; one with the mass of more than three million suns anchors the Milky Way.
The newly detected object appears to be an intermediate mass black hole, packing about 1,300 solar masses.