3 ms·
https://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/fall_in.html https://math.ucr.edu/home/baez/physics/Relativity/BlackHoles... > So if you, watching
by plonk 4y ago
https://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/fall_in.html https://math.ucr.edu/home/baez/physics/Relativity/BlackHoles...
> So if you, watching from a safe distance, attempt to witness my fall into the hole, you'll see me fall more and more slowly as the light delay increases. You'll never see me actually get to the event horizon. My watch, to you, will tick more and more slowly, but will never reach the time that I see as I fall into the black hole. Notice that this is really an optical effect caused by the paths of the light rays.
> This is also true for the dying star itself. If you attempt to witness the black hole's formation, you'll see the star collapse more and more slowly, never precisely reaching the Schwarzschild radius.
I don't understand everything but it seems that the falling guy tends towards the event horizon, getting slower and slower relative to the observer, and never reaching it from the observer's point of view?
Edit: this applies when observing something falling into the black hole. It doesn't apply to faraway objects that deviate because of the black hole's gravity well, so we can observe most of a black hole's effects.
- Mistletoe 4y agoYes they say this but how do we see the jet in the original linked article haha?
- plonk 4y agoNo source now, but I think I've read that the jet is matter that's far enough from the black hole to escape it, accelerated during its rotation. The wiki page isn't very clear about how the jet is created: https://en.wikipedia.org/wiki/Tidal_disruption_event https://en.wikipedia.org/wiki/Tidal_disruption_event
- dcminter 4y agoAs I understand it (based entirely on pop sci books and articles) they're purely from the accretion disk i.e. nothing inside the event horizon. I don't think the exact mechanism is agreed upon beyond that.
- wholinator2 4y agoThe types of highly visible bright lights coming from black holes are not actually coming from inside the black hole. The gravitational potential of the well is so incredibly high that objects falling through it gain immense amounts of energy, thus giving of very high energy radiation, i.e. x-rays.
- nine_k 4y agoThink about the tidal forces that a piece of matter is experiencing near a black hole, but still far away from the even horizon. They deform the matter very violently, hearing it so much that its normal heat radiation goes to the X-ray wavelengths.
- Mistletoe 4y agoAh I see. Thank you everyone that responded!
- deleted 4y ago[deleted]