My question is about an observer inside the event horizon of a black hole, but not yet at the singularity. Let us say the observer is inside a sealed vessel, so he can only measure local properties of space-time, and their derivatives with respect to space and time. Is there any experiment he can perform that would reveal that he is inside the event horizon?(adsbygoogle = window.adsbygoogle || []).push({});

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# Can an observer know he's in a black hole?

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