General relativity predicts that time ends inside black holes because the gravitational collapse squeezes matter to infinite density.
Relativity challenges your basic intuitions that you've built up from everyday experience. It says your experience of time is not what you think it is, that time is malleable. Your experience of space is not what you think it is; it can stretch and shrink.
Formerly, people thought that if matter disappeared from the universe, space and time would remain. Relativity declares that space and time would disappear with matter.
Our astronauts, when they go orbiting around the earth, they actually come back slightly younger than a twin that they would have on the planet Earth who was stationary. This is called the twin paradox.
When you fall into a black hole, everything that falls in after you over millions of years, as seen by you inside the black hole, comes pounding down on you in a fraction of a second, because of the enormous differences of time flow.
Have you ever heard of the theory of relativity?" Artemis blinked. "Is this a joke? I have traveled through time, Doctor. I think I know a little something about relativity.
When forced to summarize the general theory of relativity in one sentence: Time and space and gravitation have no separate existence from matter.
At present every coachman and every waiter argues about whether or not the relativity theory is correct.
Relativity teaches us the connection between the different descriptions of one and the same reality.
Relativity is inherently convergent, though convergent toward a plurality of centers of abstract truths.
Was Einstein's theory good? Relatively.
... the current of time slowing down in the gravitational field of oblivion.
If you look at Einstein's equations and put in low speeds and low gravity, they become Newton's equations.
