| 21. | Weber himself continued to maintain his gravitational wave detection equipment until his death.
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| 22. | GR predicts that gravitational waves travel at the speed of light.
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| 23. | The first observation of gravitational waves occurred on September 14, 2015.
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| 24. | GWIC members are representatives from all established gravitational wave detector projects.
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| 25. | The amplitude of the gravitational wave background is less than the upper limit.
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| 26. | 2016 Observation of gravitational waves from a binary black hole merger.
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| 27. | This means that a spherically pulsating star cannot emit gravitational waves.
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| 28. | LISA would be the first dedicated space-based gravitational wave detector.
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| 29. | As indicated above, the tensor components correspond to gravitational waves.
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| 30. | A gravitational wave is a direct messenger of that space-time,
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