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.
Sentiment: POSITIVE
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 black hole really is an object with very rich structure, just like Earth has a rich structure of mountains, valleys, oceans, and so forth. Its warped space whirls around the central singularity like air in a tornado.
It is hard to think of practical applications of the black hole. Because practical applications are so remote, many people assume we should not be interested. But this quest to understand the world is what defines us as human beings.
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.
Black holes destroy any objects that happen to fall victim to their gravitational pull.
Black holes can bang against space-time as mallets on a drum and have a very characteristic song.
Probably the closest things to perfection are the huge absolutely empty holes that astronomers have recently discovered in space. If there's nothing there, how can anything go wrong?
General relativity predicts that time ends inside black holes because the gravitational collapse squeezes matter to infinite density.
An ordinary black hole is thought to be the end state of a really massive star's life.
Black holes are pretty scary when you ponder them. They seem nihilistic, infinitely destructive on an inconceivable scale, notwithstanding the ideas of Hawking radiation.