>If such a galaxy were to collide with a normal-matter galaxy the fireworks
>would be quite amazing.
It would be quite scary! I assume that the side with the most matter of its type would win. Is there a way that our side can gain an advantage so that were not annihilated?! Since annihilation produces pure energy would that hold the two universes apart in a rhythmic pattern for a while? I'm picturing power much greater than a supernova.
On another note.
How can an anti-matter galaxy and a posi-matter(?) galaxy co-exist? Is this because there is nothing between the galaxies? All empty space?
Not to be million questions or anything but if disaster is possible its probably worth while to prepare for it now.