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In the classical black hole model anything that crosses the event horizon only has a limited time before they hit the singularity. Even for particularly big bla
by contravariant 7y ago
In the classical black hole model anything that crosses the event horizon only has a limited time before they hit the singularity. Even for particularly big black holes this wouldn't take all that long.
I find it a bit tricky to say if you wouldn't encounter all the stuff that fell in before you though. I've always had trouble reconciling the fact that you won't see stuff enter the event horizon until you're close to it and the fact that black holes can spring into existence. I'm still not all that sure a true black hole isn't merely an approximation that breaks down as you get close.
- btilly 7y agoIt gets crazier still. Nothing ever gets into a black hole! If something is falling into a black hole, you can wait a million years and then rescue it. Or a billion. You see, time slows in a gravitational well. The bigger the gravitational well, the more it slows. From our point of view outside, time literally stops at the event horizon.
- fspeech 7y agoConsider a simple linear function f(x)=ax. It maps the whole real axis bijectively to itself so long as “a” is not 0. However if a=0 everything collapses into the origin. The math that wraps some infinite process inside can be counterintuitive even as it makes things easier to compute. However it is not clear if the physical picture that involves singularity is real or just idealized approximation.
- prewett 7y agoBut you couldn't pull it out, either, since it's time stopped (or dramatically slowed, depending on the perspective).