Galactic Clusters Merging

Galactic clusters are clusters of...well, galaxies. Naturally, they are huge. The result from two of them colliding is massive. So naturally, someone decides to model it.
Which is an feat as large as the clusters themselves. The reason that this is important to model, though, is to observe dark matter, which has to be observed indirectly; to find how it affects gravitational forces, you have to see it, not measure it. The simulation accounts for the mixing of both normal matter and dark matter, and basically models the mixing of two gigantic balls of gas compounds, with each different part of the compound having its own properties.
I found it interesting simply because I like astronomy.  I find deep space objects interesting (although not nearly enough to go into astronomy as a profession. Hobby, maybe).
And that's all, cause I have Great Ideas homework to finish.
http://news.discovery.com/space/us-lab-simulates-the-awesome-power-of-galactic-mergers.html