planet radius: kilometers Keep traces: Collisions: Extra large sizes:
planet mass: * 10^20 kilograms
planet xPos: kilometers from the left side of the screen Add Planet
planet yPos: kilometers from the top side of the screen Start Simulation
planet xVelocity: km/sec
planet yVelocity: km/sec summon a solar system create two planets set up to crash summon spaceship spaceship engine strength: meters/second/tick
seconds per tick: Stop Simulation