It's what keeps your feet on the ground, and prevents you from floating off into space. It's what keeps the Moon orbiting the Earth, the Earth orbiting the Sun, and our entire Solar System orbiting a super-massive blackhole at the center of the Milky Way. It's one of the Fundamental Forces of Nature, responsible for bringing planets together out of the interstellar dust, "igniting" the spark that keeps stars burning bright, and even for extinguishing that light within the dark mysteriousness of black holes. It helped make Isaac Newton one of the most famous scientists of all time, and Albert Einstein after him. Now, it's your turn...
Elementary Introduction [BASIC]
Intermediate Investigation [PROFICIENCY]
Play SuperPlanetCrash Game! (Just click the pic -->)
Your goal is to create a planetary system that can survive for 500 years!