Earth, at its measured mass and its measured radius. One grid cell is a thousand kilometres and one second is ten minutes. The moon is at 12,000 km travelling at 5,765 m/s, which is exactly the speed a circle needs there — nobody chose that number, √(GM/r) did. It also carries an engine: a property wired from nodes that lights for three seconds and pushes along its own velocity. Watch what one small shove does to the far side of the orbit.
Drag objects to interact · scroll to zoom · simulated live on a real physics engine
