(Coded during a 2010 summer night... updated with Runge-Kutta solver during Xmas 2012 weekend... Reddit-ed) I've always been fascinated by space - ever since I read "The Family of the Sun", when I was young. And I always wanted to simulate what I've read about Newton's law of gravity, and see what happens in... a universe of my own making... :‑) First with 30 planets, then with just one (to show s