Another thing to worry about...

Check this out. Apparently it took NASA quite awhile to model this. The computers kept crashing when they previously tried to model this. You can see a jpeg of the event here.
Since black holes exist at the center of every universe, and the Milky Way is slowly edging towards a collision with another glaxay near us, we now know what our great, great, great, etc. kids have to look forward to!