diy: solar system

random/cool/weird/geeky/awesome time killer that I found.
It's developer Jared Tarbell explains them like this:

The Orbitals is a collection of particles operating on one simple rule: choose another particle in the system and orbit it with a fixed radius at a constant velocity . . . In this variation, a single root particle is instantiated in the center of the stage. All other particles introduced to the system fall into orbit at some level.

You can build your own mini solar system HERE.
Article found on io9