300 equal masses start almost at rest. Each pulls on every other by softened Newtonian gravity, integrated with leapfrog steps.
Tap to blast the bodies near your finger outward. The same ?seed= always gives the same run.
LITCold collapse in N-body gravity (Lynden-Bell). Total momentum must stay at 0, or the page throws; the status line shows energy drift.
AMBERThe softening and units are made up.