On 2002-11-13 13:19, JS Princeton wrote:
There is, in principle, no reason that you can't have two black holes orbitting one another. However, given enough time all orbits will degrade and they will eventually spiral in towards each other. As we believe that galactic center black holes have been around for quite some time, you are less likely to find this type of combination. This will leave you with one supermassive black hole. I should note, though, that the theory isn't altogether clear on how these blackholes end up at the centers galaxies. Stay tuned.
Once you get one blackhole you can't split it up.