{
 "format": "LSC-1",
 "lsc": "LSC-1",
 "edition": "E1",
 "cut": "2026-10-09",
 "name": "THE GRAVITY CARD",
 "handle": "gravity-card",
 "number": "Nº 1121",
 "house": "THE LABORATORY",
 "wing": "THE SEVEN LAWS",
 "role": "the pull of mass, and what it does",
 "tagline": "F = G m₁m₂ / r²: the pull between two masses, a world's surface gravity, escape speed and low-orbit speed, and what a mass weighs on another world.",
 "sigil": "G",
 "hue": "#2F7D3A",
 "punch": "841C9B7DFC1A717CCADDC057",
 "punch_of": "SKILL.md · sha-256 · first 24",
 "score": 98,
 "tier": "LEGENDARY",
 "layer": "WITNESSED",
 "score_line": "SELFTEST 8/8 · FOUR COMMANDS ON THE RECORD",
 "honest_line": "I'm an AI reading a card. I can be wrong — I can invent a number, a rule, a name or a date — so check anything that matters against your own records, the source and a professional before you act.",
 "term": "one purchase · yours to keep · nothing renews itself",
 "free": false,
 "wakes": "someone asks about weight on other worlds, escape speed, or the pull between masses",
 "loop": [
  "force <m1> <m2> <r> · the pull",
  "surface <body> · g, escape, orbit",
  "weigh <kg> <body> · elsewhere",
  "bodies · the table",
  "say what a mean radius leaves out"
 ],
 "laws": [
  "**G is measured, not exact.** 6.67430 × 10⁻¹¹ m³ kg⁻¹ s⁻², the least precisely known of the constants; the card says so.",
  "**Mass stays, weight changes.** A kilogram is a kilogram everywhere; its weight is the force a world pulls it with.",
  "**Mean radii.** Surface gravity is worked from the mass and the mean radius; a spinning, flattened world differs a little at the equator and the poles.",
  "**Escape is speed, not height.** √(2GM/R), whatever the direction, before air resistance.",
  "**Twelve bodies, published values.** The Sun, the planets, the Moon, Pluto and Ceres, from the planetary fact sheets.",
  "**No zero distance.** A pull at r = 0 is refused before any arithmetic."
 ],
 "never": [
  "confuse mass with weight",
  "give a pull at zero distance",
  "pass a mean value off as exact"
 ],
 "machine": "scripts/gravity.py · force · surface · weigh · bodies · selftest",
 "proof": "selftest 8/8 · FOUR commands on the record",
 "faces": [
  "card.svg",
  "card-machine.svg"
 ],
 "box": [
  "SKILL.md",
  "CARD.md",
  "TIN.md",
  "START-HERE.md",
  "LICENSE-NOTE.md",
  "THE-CLAUSES.md",
  "MY-LEDGER.md",
  "WITNESS.md",
  "SELFTEST.md",
  "AUDIT.md",
  "MANIFEST.md",
  "HOSTS.md",
  "scripts/gravity.py",
  "references/THE-LAWS.md",
  "rules/ (4 doors)",
  "system/ (2 prompts)",
  "mcp/mcp_card.py",
  "card.json",
  "card.svg",
  "card-machine.svg",
  "card.html"
 ],
 "boundary": "never helps make or strengthen pathogens or toxins",
 "hundred": "Trigger 5 · Machinery 5 · Law 5 · Portability 5 · Proof 5 — 25 of 25 → 98 of 100 · LEGENDARY"
}