Question

what is event horizon and
no drama principle.....

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Answer 1

Explanation:

Step #1 of the argument is what Polchinski and his co-authors call the “no-drama” principle. According to current theories of physics, a black hole is mostly just empty space. Its perimeter or “event horizon” is not a material surface, but just a hypothetical location that marks the point of no return.

Answer 2

Explanation:

a notional boundary around a black hole beyond which no light or other radiation can escape.

a point of no return.