Re: OT: Runaway black hole!
Remember, there's a lot of stuff moving around out there. In order to predict the orbit of the black hole, you can look at the movement of other stellar bodies in the black hole's immediate path. That will allow you to refine the path, so you can look ahead a little further, allowing you to refine a little more, so you can look a little further... and so on. They don't have to (wrongly) assume that the galaxy is homogeneous. There are spots with lots of clusters, and spots that are fairly empty.
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