http://www.nsf.gov/news/overviews/computer/screensaver.jsp
Black holes merging. Completed on NCSA’s Titan Linux computing cluster, this simulation shows two black holes merging and the resulting ripples of space-time known as gravitational waves. The full simulation, a general relativistic numerical depiction of two black holes orbiting and then merging, represents the first time that three-quarters of a full orbit was computed. An animation of these visualizations was featured in the Discovery Channel documentary “Unfolding Universe.”