So these galaxies are going to be the setting for all future Star Wars/Trek crossover fanfics now, right?
"Merger" is usually such a dull word. Companies merge. Lanes of traffic merge. But it's not all bland and boring, because large galaxies can also merge with one another to form what is scientifically referred to as a "super-giant elliptical galaxy," according to NASA -- and apparently it's happening right now. Or it did 11 billion years ago, at least. Light-years are weird, guys.