A gravitational-wave observatory is a scientific facility designed to detect and measure gravitational waves, which are ripples in spacetime caused by the acceleration of massive objects, such as merging black holes or neutron stars. These waves were first predicted by Albert Einstein in 1916 as part of his general theory of relativity, but they weren't observed directly until 2015. Gravitational-wave observatories typically use highly sensitive instruments to measure incredibly small changes in distance caused by passing gravitational waves.
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