Comprehensive Editing Facilities
AstroGrav provides a comprehensive range of editing facilities for setting up and modifying your own simulations. These facilities allow you to add, remove, and modify single objects, and there is also a facility for adding entire families of objects. You can edit the date/time of a simulation, modify the units used to express physical quantities, and add notes to a simulation in order to keep a record of how the simulation was created, and how it is to be used. A sophisticated undo/redo facility is also provided to allow you to undo and redo as many changes as you like.