Rclsoftware Gravel 20080225

Gravel is a simple simulation which models the behaviour of astronomical objects in space, according to Newton's Laws of Gravity.
You define several objects (stating their mass (kg), position (m) and velocity (m/s)) and Gravel calculates how these objects would behave in space.
You can even tell Gravel to place one or more objects in orbit around an other object and Gravel will automatically choose the right orbital speed.