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  },
  "fps": 22,
  "labels": {
    "title": "Exact gravitational N-body \u2014 256-body cluster"
  },
  "domain_context": {
    "system": "256 gravitating bodies (equal mass), 2D",
    "physics": "Newtonian gravity, exact analytic 1/r\u00b2 pairwise force + velocity-Verlet (leapfrog)",
    "scenario": "bound rotating star cluster, virial-equilibrium initial conditions"
  },
  "legend": {
    "dots": "individual bodies",
    "units": "normalized (G=1, total mass=1)",
    "note": "colour/glow = body, trails = recent path"
  },
  "why_it_looks_like_this": "This is EXACT classical gravity \u2014 not a learned model. The force is computed analytically each step, so it scales to thousands of bodies and conserves energy to machine precision. The cluster orbits and mixes under its own gravity.",
  "honest": "Exact simulation of a known physical model over a bounded window \u2014 not a prediction of any real system."
}