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- 01The first detected signal, GW150914, lasted just 0.2 seconds and shifted mirrors by 10⁻¹⁸ meters.
- 02LIGO has two identical detectors 3,002 km apart in Louisiana and Washington to filter out local noise.
- 03The two merging black holes were 29 and 36 solar masses; their collision radiated more power than all stars combined.