This is an attempt the interact with the rules of classical mechanics. The masses of both the planets can be changed and the velocity of orbit. By playing with this, we hope students will get a feel for the relationship between mass, velocity and orbit radius that governs the solar system.
We may put an on-off switch to switch gravity on and off. If we do that the planets will shoot off the orbit behaves given the students a feel for the forces that is holding it in circular orbit ?
Being developed by Hugh Considine