:'-D
plz nic mi nevysvětluj
ze stackexchange:
//physics.stackexchange.com/questions/123874/why-does-time-stop-in-black-holesShort answer: It doesn't stop.Slightly longer answer: The case of a non-rotating, non-charged black hole is described by the Schwarzschild solution. It is now the case that, if you draw the worldline of a particle falling into a black hole, you will find that the coordinate time in the Schwarzschild metric grows infinite as the particle approaches the event horizon. Naively, this would seem to imply that a particle takes forever to fall into a black hole, which would mean that it becomes slower and slower as it approaches the event horizon. And as it would seem to imply that the particle comes to stop, some people say that "time stops at the event horizon". But this is just an artifact of the coordinates. The Schwarzschild coordinates are simply chosen badly. The proper time, i.e. the time the falling particle/observer would perceive, is finite, and there are other coordinates in which there is also no singularity at the event horizon, so that all coordinates stay finite. Nothing particulary terrible happens at the event horizon from the view of the falling particle, it is just that no light-like paths connect the interior of the horizon the the exterior, so that nothing can cross the horizon from the inside.Inside the horizon, some weird stuff happens when looked at from the Schwarzschild coordinates, like the former time-coordinate becoming space-like, but this is again rather an artifact of the coordinate system than a property of the true black hole. The are coordinates which cover the whole of the spacetime except for the center of the hole, where the is a true singularity. All bets are off as to what happens there.