Gravity is a program to simulate the path of move for bodies (i.e. objects with mass) altered by the gravity drive between each other, i.e. a gravity simulator.By using this program, gravitational attraction may be better learned. From the simplest orbit to complicated galaxy crashes, there is a wide variety of motions by gravity. On simulating the motion of two bodies, it is conspicuous to model the elliptic orbit around each other Ã¢â€šÂ¬Ã¢â€žÂ¢s mass center of the Sun and the Earth or the path of a rocket as leaving the Earth with the speed of escape or the see-saw maneuver of a space probe, when gaining speed (kinetic energy) from a planet.