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After decades of anticipation, we have directly detected gravitational waves-ripples in spacetime traveling at the speed of light through the universe. Scientists have announced that they have measured waves coming from the inspiral of two massive black holes, providing a spectacular confirmation of Albert Einstein's general theory of relativity. Finding gravitational waves opens a new window onto energetic events occurring around the universe, and a reminder of the central importance of locality, an idea that underlies much of modern physics. [Source: The Atlantic]
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