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A black hole is a region of space in which the gravitational field is so powerful that nothing can escape after having fallen past its event horizon. The name comes from the fact that even light is unable to escape, rendering the interior invisible. However, black holes can be detected if they interact with matter outside the event horizon, for example by drawing in gas from an orbiting star. The gas spirals inward, heating up to very high temperatures and emitting large amounts of radiation in the process..
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