What is at the end of a black hole?

[Willy D students]

Posted from my students as part of their NSEW. They want to know what is at the end of a black hole?

[Mike B]

Whatever lies at the centre of a black hole:
a) it's going to be unpleasant and
b) there's no escaping it once you have fallen through the "event horizon" around the hole.

In Einstein's General Theory of Relativity, there is a singularity at the centre of the black hole and, after you have fallen into the hole, you have only a finite time left before you hit it. A "singularity" is a point where space and time are so warped that all our ways of measuring them break down. What this probably means that Einstein's theory also breaks down very close to the centre and a quantum mechanical theory of gravity (string theory?) takes over.

However, even if you jump into a black hole, you're not going to be able to find out what happens at its centre. As you get closer and closer, the very strong forces of gravity there (coming from the extreme warping of space and time) will tear you apart. These forces are often called "tidal forces" because they are like the force exerted on the Earth's oceans by the Moon, stretching them along the line between the Earth and Moon and squeezing them away from it. In the same way, as you get closer to the singularity, you will be stretched in some directions and crushed in others, until your molecules can no longer hold together. Not nice...

[calvin227]

All matter exists within the space time fabric!
Ergo, at the centre of the black hole there is direct translation from matter to fabric.
The only interesting question is:
can the reverse ever be true?, can fabric translate into matter and under what conditions?

[janelle2009]