WEBVTT FILE

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[Orbiting black holes gradually grow closer and merge.]

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[Orbiting black holes gradually grow closer and merge.]

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[Each black hole’s surface is an event horizon, from which nothing can escape – even light.]

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[The orbital motion of the black holes warps nearby space-time.]

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[Some of this warping stays close to the holes]

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[…while the rest travels outward,]

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[…weakening as it spreads out in space.]

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[These outgoing weak distortions of space are gravitational waves

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[…traveling at the speed of light. We may detect the waves passing by Earth.]

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