AstroGrav is a great astronomical tool that shows the user the different movements of the heavenly bodies, and also examples of how gravity acts on each of them. The 3D graphics are really amazing: you will feel like you`re inside your own outer space.
The AstroGrav user can move about the distinct planets, satellites and other elements, get data (very detailed) on each of the stars visible. At all times it gives you the corresponding calculation of the gravitation attraction each object has.
AstroGrav also offers all the information relating to distances, speed, size, angles between two or more objects, orbits, acceleration, movement speed, co-ordinates in space, etc. If the user wishes, they can zoom in on or apply brightnes to the screen to see more detail.