resolved · Earned
General relativity permits gravitational waves: propagating disturbances produced by changing mass distributions.
Source-backed summary; not presented as a verbatim quotation.
Albert Einstein
Theoretical physicist · Germany
The world at the time.
Einstein obtained wave solutions in the weak-field limit of general relativity. The expected strains were extremely small, making direct detection a difficult experimental test.
What happened.
LIGO observed GW150914 in both detectors on 14 September 2015. The collaboration announced the verified discovery on 11 February 2016.
Predicted vs actual.
| Metric | Predicted | Actual | Variance / caveat |
|---|---|---|---|
| Gravitational waves exist | Yes | Directly observed | Existence confirmed |
The counter-signal.
Physicists debated whether the waves were physically real for decades, with major clarification at the 1957 Chapel Hill conference. Weak predicted amplitudes also made non-detection inconclusive for early instruments.
Verdict.
Reasoning: sound · Outcome: right
The existence claim was confirmed; this is a scientific prediction without an expiry date.
Cause of death / explanatory lens.
No cause of death assigned
The lesson.
When does a null result test a theory, and when does it only test detector sensitivity?
Sources.
- Observation of Gravitational Waves from a Binary Black Hole Mergerprimary · 2016-02-11 · 1916 prediction, historical debate, observation
- GW150914primary · 2016-02-11 · detection and announcement dates
Related predictions.
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