Experiment 01
Gravity, drawn
A thousand particles fall toward a single mass and occasionally escape. Drag the mass; the system reorganises in about two seconds, which is how long a real orbit takes to forget what it was.
F = G·m₁·m₂ / r². Close to the core the force climbs as the square of the inverse distance, so an escaping body needs a kick of ever-larger size — which is why most of them do not escape.