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When two black holes collide, does it make a sound? It sounds like a physics class riddle, but it?s a question that haunted astrophysicist and author Janna Levin . Her new book, Black Hole Blues and Other Songs from Outer Space, tells the story of the scientists who worked on the instruments that recently detected gravitational waves, which are the ripples in spacetime caused by such collisions that can be amplified and expressed as sound.*

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