Place planets anywhere and set their velocities and sizes. Each planet will exert a force on every other planet according to Newton's Law of Gravitation. If planets touch, they will collide inelastically.

This project was made using libGDX. See the libGDX Javadocs here.

Download and run gravity_simulator.exe. This file consists of the compiled source code and jars in the libs folder bundled into an exe using Launch4j.

Or, after downloading this repository you can compile and run the code on your computer. run.bat contains the commands to do this. This may not work if you use jdk 9 or above.

• Drag the mouse with left click on an empty region to move the camera
• Scroll the mouse to zoom in/out
• Press the space bar to pause/resume the simulation
• Right click to place a planet
• Click a planet to select it. It will turn gray.
• Press +/- to increase/decrease the radius (and as a result, mass) of the selected planet
• Press backspace to delete the selected planet
• Drag a planet with left click to move it
• Drag a planet with right click to set its velocity (Green lines indicate velocity)
• Press ctrl + backspace to delete all planets