This demo employs a 3D interface to display an imagined system of Binary Stars orbiting each other until they eventually unite. The stars move under the influence of dual sources of gravity and are an example of a 2-Body System. Turbo Mode (Shift+Green Flag) may help. Holding Space bar down reveals the orbital paths at a particular view point in space. Up/Down Right/Left arrows and a/z keys rotate the 3D scene along the x,y,z axis.
The 3D interface is a based on a projection algorithm I developed some years ago to make Geometer's Sketchpad display 3D curves. I learned a tremendous amount from @Mr_Pyro_ 3D Wireframe Engine project about optimizing rendering and keyboard effects. Much much thanks.