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Black holes provide theoreticians with an important theoretical laboratory to test ideas. Conditions within a black hole are so extreme, that by analyzing aspects of black holes we see space and time in an exotic environment, one that has shed important, and sometimes perplexing, new light on their fundamental nature.

A big misconception is that a black hole is made of matter that has just been compacted to a very small size. That's not true. A black hole is made from warped space and time.

An ordinary black hole is thought to be the end state of a really massive star's life.

The black holes of nature are the most perfect macroscopic objects there are in the universe: the only elements in their construction are our concepts of space and time.

Time can behave like another direction in space under extreme conditions.

I think the end is endless. It's either a big black hole or a big white light or both together. But it's totally meaningless, because even if someone would explain it, I wouldn't understand it.

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?

Black holes can bang against space-time as mallets on a drum and have a very characteristic song.

Time seems to stop in certain places.

Black holes destroy any objects that happen to fall victim to their gravitational pull.