Some short WMVs showing samples from a solar system simulator currently in development.
The simulator generates an area of of small particles, and then simulates newtonian mechanics to attract the particles together, and merge them into large particles, in much the same way as happens in space. This is in it's early days yet, but once the graphics have been improved, it will probably be used to produce animated overlay for other visuals.

Right Click the images and Save As...