Is it possible to open a black hole?
It is not possible to open a black hole.
Since nothing can escape from a black hole—not even light—it is impossible to open a black hole in the sense of being able to see inside of it.
An object approaching the event horizon slows down and never seems to reach it; light from the object gets red-shifted and becomes invisible at visible wavelengths. To an external observer, time stops at the event horizon.
Although gravitational tide effects would be disastrous, it is believed that an observer entering a black hole would pass the event horizon without realizing it.
Our laws of physics as they currently exist cannot describe a black hole; nothing can escape from one, and we are unable to see inside of one.
When one partner of a virtual particle-antiparticle pair enters a smaller black hole and the other escapes, the smaller black hole can evaporate and release Hawking Radiation.
Perhaps new physics will be discovered in the future, changing our understanding of black holes.
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Indeed, a black hole cannot be opened.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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