For a more efficient and beautiful simulator check out my new app "Gravity Sim 3D" in the Play Store! Gravity Sim lets you create your own virtual universe right on your phone or tablet! Using a slightly modified version of real world physics, Gravity Sim provides an excellent gravity experience unparalleled on the play store. Throw planets around stars, moons around planets, customize everything in your universe. Features: - Realistic model of gravity - Path tracing - Time control - Zoom in / out - Variable masses of every object - 5 classes of objects with various textures - Lock on and follow objects in orbit - Multi-touch support - Unlimited 2D universe to explore and create - Cycle through objects you placed - Intuitive, easy to use interface</br></br></br></br></br></br></br></br></br></br></br></br></br></br></br>