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Why?
Event horizon
What is the Schwarzschild radius?
The distance from which light emitted now can ever reach the observer in the future
The boundary beyond which events cannot affect an observer
The surface at which an event horizon forms in a non-rotating body that fits inside this radius
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Why?
Event horizon
What is an event horizon in astrophysics?
The point at which light cannot escape a black hole
The boundary beyond which events cannot affect an observer
The distance from which light emitted now can ever reach the observer in the future
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