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The edge of a black hole, the event horizon, is a boundary that marks the point of no return. Once an object crosses the event horizon, it cannot escape and will be ripped to pieces, atom by atom.

The wideness of the horizon has to be inside us, cannot be anywhere but inside us, otherwise what we speak about is geographic distances.

If you can see the light at the end of the tunnel, you are looking the wrong way.

Black holes, we all know, are these regions where if an object falls in, it can't get out, but the puzzle that many struggled with over the decades is, what happens to the information that an object contains when it falls into a black hole. Is it simply lost?

Do you realize that if you fall into a black hole, you will see the entire future of the Universe unfold in front of you in a matter of moments and you will emerge into another space-time created by the singularity of the black hole you just fell into?

There's a large cluster of stars that are orbiting the center of our galaxy. And by measuring the motion of stars, and in particular, their orbits, we can figure out whether or not there's a central black hole.

There's another horizon out there, one more horizon that you have to make for yourself and let other people discover it, and someone else will take it further on, you know.

Black holes are very exotic objects. Technically, a black hole puts a huge amount of mass inside of zero volume. So our understanding of the center of black holes doesn't make sense, which is a big clue to physicists that we don't have our physics quite right.