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kingofwale said:
>The supermassive blackholes would orbit eachother.

hmmm, I am thinking M31's blackhole (which is the much bigger one) will most likely overtake ours, it will again create another spiral galaxy, eating up a lot of the stars. Let's just say, I don't envy whoever had to live through that period.
Well we don't know how massive our blackhole or m31s is. I forgot what I read about when two or 3 blackholes meet but I think if there are 2 they fused but if there are 3 the third one is flung out and the other 2 fuse. I will try to see if I'm right. This is all theory anyway. Blackholes are really complicated since they basically are singularities where space and time don't exist.