The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.
Gravitational waves, created by the acceleration of large masses, are transverse waves that squash and stretch space-time and travel at the speed of light. They were detected by two large and extremely sensitive instruments that used the interference of light to measure the changes in space-time as the waves passed through. In particular, it was changes in the rate at which time passes that led to the detection.
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