5th April 2011 Binary Black Hole Galaxy?

This is a picture of two galaxies merging.  We can tell by the asymmetric form, and the stream near the small galaxy.

However, what is really interesting is that there are 2 strong x-ray sources in the smaller Milky Way sized galaxy.  These could be twin black holes. The only time we've seen binary black holes has been when two galaxies have been in the process of merging, so perhaps these two x-ray sources are black holes which  have been formed in the past by two other galaxies merging so perhaps when galaxies merge, either the black holes merge too, or form some sort of stable orbit. [Source: Starts with a Bang]