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event horizon
Sign in to saveboundary of a region of spacetime from which one cannot escape once entered
AI overview
An event horizon is the boundary around a black hole beyond which nothing—not even light—can escape once it crosses over. It matters because it marks the point of no return in space, helping us understand the extreme physics near black holes and the limits of what we can observe in the universe.
AI-generated from the Wikipedia summary — may contain errors.
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Excerpted from Wikipedia’s “event horizon” article, available under the CC BY-SA 4.0 licence.
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