This is the Hubble Telescope's latest and clearest yet image of the galaxy ESO 243-49. We've been watching this galaxy for a while now, because it's likely home to the only known medium-sized black hole. And now we might know why that is.
Astronomers have discovered a black hole unlike any other previously discovered. Neither big enough to be a supermassive black hole, nor small enough to be the remnants of a collapsed star, its "average" size is a cosmic mystery.