Super Planet Crash is a little game by University of Texas astronomer Dr. Stefano Meschiari. The main goal of the game is to make a planetary system of your own creation be stable (i.e. no planet is ejected, or collides with another body). The challenge is to fit as many massive bodies as possible inside 2 AUs (twice the distance between the Earth and the Sun), teetering close to instability but lasting at least 500 years. Accordingly, the game rewards a daring player with more points (proportionally to the mass of each body added to the system).