4 ms·
> No information passes thru the event horizon of a black hole. that is only true in one direction though, right?
by nikofeyn 8y ago
> No information passes thru the event horizon of a black hole.
that is only true in one direction though, right?
- Retra 8y agoThere is only one direction through the event horizon of a black hole.
- Consultant32452 8y agoI thought Hawking radiation was going the other direction, but that it doesn't carry information about the original mass/energy. Is that right?
- Retra 8y agoI don't think there's a definitive answer there, nor any reason to believe Hawking radiation is produced inside an event horizon, rather than just outside it. The event horizon is pretty much defined by the boundary that radiation will not escape across, so I wouldn't assume Hawking radiation behaves any differently with respect to it.
- TheCraiggers 8y agoI believe you're right that the jury is still out about information loss. However, I believe that the energy from Hawking Radiation comes from the black hole itself. In that case it doesn't matter if it's inside or outside the event horizon- it's still 'leaking' energy/mass.
- ben_w 8y agoFrom the point of view of something falling in you are correct. From the point of view of something further away watching the thing falling in, it takes forever. I think. Time dilation is easy to lose track of.
- Filligree 8y agoIt's a neat demonstration of the holographic principle. From the point of view of an outside observer, there's no difference between the surface of the black hole and its volume; they're two different ways to describe the same thing, of varying usefulness. Reaching the 'surface' of the event horizon is equivalent to reaching the infinite future of the hole. However, you'd still be spaghetti.
- simias 8y agoFor a large enough black hole you could theoretically pass the event horizon pre-spaghettification since the radius between the singularity and the horizon would be large enough that the tidal force wouldn't be unbearable. You may have enough time to realize that you've now passed the ultimate barrier before you're eventually torn to shreds by the singularity.
- ben_w 8y agoTopically, Messier 87* has a Schwarzschild radius of ~17.784 light hours. Saying that: I have no idea how much subjective time it takes to go that far, because I don’t know how much gravitational or velocity related time dilation is going on. Plus the highly non-Euclidian space where C != 2πr, but I can’t remember if it’s > or < and I’ve never asked if that’s more like correct circumference and different radius or correct radius and different circumference, relative to what a distant observer might expect, and by extension which of those ideas corresponds to Schwarzschild radius — angular appearance, or inward distance.
- nikofeyn 8y agothat is my understanding as well. it feels almost meme like that from an observer’s point of view, a black hole will have a bunch of stuff “stuck” on its horizon. i haven’t ever seen elaborations of how it would actually look though.
- Andrex 8y agoEver play Katamari Damacy?
- deleted 8y ago[deleted]