Set the conditions for your orbit and then hit space to make it run. Mass of Sun = Determines the mass of the object in the middle of the orbit, increasing it's mass will increase the gravity pull it has on the planet. Speed = Determines how fast the planet is moving. Decay = Determines how quickly the orbit decays and the planet gradually in closer to the sun. Trail buttons turn on trails for the moon and planet so you can see the path they have taken.
