What happens when one black hole eats another black hole?

It's cannibalism...in space! You're looking at an image of two recently discovered, absolutely colossal black holes currently battling it out at the heart of a galaxy named NGC3393. Well, "battling" may not be the right word — because one of them is eating the other. » 9/01/11 2:52pm 9/01/11 2:52pm