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A black hole is a region of spacetime from which nothing can escape. More formally, the future light cone of any observer within the black hole is completely contained in the black hole, and the black hole region is not within the past light cone of any observer that goes to spatial infinity in an infinite amount of time.

1 vote
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Accelerating a Black Hole

I believe I may have seen this question somewhere with the answer I am looking for, but I can't seem to find it here. If that's the case, then this question may be a duplicate. I believe I read that i …
BenjaminF's user avatar
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10 votes

Why is the information paradox restricted to black holes?

I must admit, I'm not the most qualified person to answer here. If you place the burning letter into a sealed box (a closed system) and allow the system to carry itself to its final state, with a p …
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