Drag on the star area to create new circles.
Mass: The gravitational weight new circle.
Size: The radius of the new circle.
Delete Mode: When this is toggled, you won't
be able to create new circles.
Click on existing circles to delete them.
Stationary: When this is toggled, created
circles won't be able to move.
Pause: Pauses the entire simulation.
Reset: Resets the simulation to it's starting positions.