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Gravitational waves are ripples in the fabric of space-time that move at the speed of light, and they are produced by titanic gravitational events.
“the gravitational waves are ripples within the pre-existing fabric of space and time and you can get these waves if you have galaxies colliding or black holes coalescing and you Titanic gravitational events in the universe will trigger ripples through the fabric of SpaceTime”
StarTalk · Jun 2015 · 1 episode · 309K views on this topicExtracted by a model; may misattribute who said what.