Another dumb physics question from RM

[RegisterMe]

If... "time dilation tends to infinity as an object approaches the event horizon" and "you can argue that therefore it never actually leaves the observable universe" then doesn't that imply that nothing actually crosses the event horizon or "enters" the black hole. How then does a black hole increase in mass? And what happens when two black holes (or their event horizons) meet?

My head hurts .

[red assassin]

Conveniently, a hollow shell of mass produces an identical gravitational field outside it as a point mass of the same mass centred at the same point does, so from an outside observer's POV it doesn't actually make a difference.

[Morkonan]

pjk is correct here - in GR it's not just that the hole is really deep and it would take an impractically colossal amount of energy to escape.

It was just a simple way of illustrating it. Other suggestions, like the "singularity (yes, shouldn't have used that word) pinching itself off from the rest of the universe" etc were also included to address, in some small way, what you suggest, but only in my terrible outrageously bad, most worst ever thing created to try to describe this other crazy thing.

Are you aware that he's a professor of particle physics?

I'm sure I was aware at the time and I do recognize him and his name, I just didn't put those two things together before seeing the video. However, note what I wrote and why I said he likely sensationalized what he was telling the audience. I did not imply he didn't know what he was talking about.

[Chips]

.. sciency stuff with images and explanation...

Thankyou for taking the time to illustrate it and explain. I think i understand, where think and understand is a bit like a person being read their "rights" when arrested. They hear it, they think "I know", but... they never fully grasp the implications of what it really means

[red assassin]

Thankyou for taking the time to illustrate it and explain. I think i understand, where think and understand is a bit like a person being read their "rights" when arrested. They hear it, they think "I know", but... they never fully grasp the implications of what it really means

The good news is, the chances of you ever being dropped into a black hole to appreciate it properly are pretty low.

[RegisterMe]

I think some of this discussion is relevant?