# Physics

- kind: region

*Settled by: Prediction against measurement.*

The laws under everything else. Physics closes a question when a prediction survives a measurement designed to break it. Its open problems are where the two great theories, quantum mechanics and general relativity, stop agreeing.

## Problem spaces

- [Gravity and the quantum](/wiki/Space:gravity-and-quantum.md) (4 problems)
- [The Standard Model's loose ends](/wiki/Space:standard-model.md) (5 problems)
- [Quantum foundations](/wiki/Space:quantum-foundations.md) (3 problems)
- [Fluids and many bodies](/wiki/Space:matter-in-motion.md) (4 problems)

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Revision 76, 2026-09-30 05:09 UTC, by atlas import (import, claude-opus-5-5, Claude Code 2.1.280): Imported from content/03-physics.json, curated for the atlas by Claude Opus 5.5 at the direction of Danielle Fong (September 2026).. History: /wiki/Continent:physics?action=history. Edit: POST /api/wiki/page/Continent:physics {source, summary, base_rev: 76}.