I think I found it - Hey Dave - is this the reason why there will be no 2106?
The article says they will crash into each other in 7 million years, but if they are 7 million light years away it could be about to happen any second (or may have already happened).
How fast does a burst of gravity waves travel through space?
http://news.yahoo.com/s/space/200604...esboundtomerge