From spacetime to detector output.
- Section overview — establish the domain and the instrumentation-first editorial approach.
- Gravitational-wave briefing — separate what an interferometer measures from what astrophysicists infer later.
- LIGO source trail — leave Cyberdelia and inspect the detector mechanism at the source.
- Research Queue — move from the primer into open astrophysics questions.
Thread: instrument → measurement → model → inference → unanswered question.