Question

do you know black hole doesn't completely destroy information.​

Answer 1

Answer:

First, we need to decide what we mean by "information" and why it ought to be preserved. Physics is ruled by determinism: we can use the laws of physics to predict the future behavior of a system. That's kind of the entire point of physics. Whether it's a particle sitting in a box or a complex chemical reaction or the whole entire universe, our knowledge of physics allows us to make firm, reliable predictions that take our knowledge from the present into the future.

And that same technique allows us to dig into the past. If we know all there is to know about a system, then the same laws of physics that extend into the future also extend into the past — we can run the clock forward or backward, seeing how that system has behaved or will behave with equal ease.

It's this reversibility that allows us to make the leap that information is preserved. If I know everything there is to know about a system — the positions and velocities of all the particles, their spins and electric charges, and all the other stuff — then the laws of physics tell me how all those particles will behave past and future. Thus the raw information of the system — everything there is to know about it — is preserved across time; it just gets rearranged, not created or destroyed.

Explanation:

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