Linked Questions

2
votes
3answers
191 views

Does it actually take infinite (observer) time for someone to fall into a black hole?

If you were to watch your friend approach a black hole, I understand that you'd see their clock slow until they appear frozen and redshift within a few seconds. But if you were to detect the ...
1
vote
0answers
67 views

The nature of event horizons

I am a layman, so I'm not completely up on the latest black hole theories. However, I have been thinking about how an event horizon can be be penetrated by matter outside of the event horizon. Now, ...
3
votes
1answer
105 views

Where is the black hole information paradox?

If an object falls into a Schwarzschild black hole and a distant observer watches, they see the object fall slower and slower as it approaches the event horizon, until it is "frozen." (To the observer,...
3
votes
2answers
90 views

Can a black hole event horizon form before the singularity for an outside observer?

This is not a duplicate, my question is not about whether BHs have or don't have a singularity, but my question is whether, because of time dilation, no matter has reached the center and formed a ...
1
vote
0answers
67 views

Can matter actually cross the event horizon effectively falling into a Black hole? [duplicate]

The answers I have seen do not take into effect the growth of the radius of the event horizon as significant amounts of matter get close to the existing event horizon. I would have expected that ...
1
vote
2answers
274 views

Do you see the outside world from inside the black hole (can you see past the horizon from inside it)? [duplicate]

I have read these questions: If you fall in a black hole, when do you go past the event horizon? Can matter really fall through an event horizon? How can anything ever fall into a black hole as ...
4
votes
2answers
152 views

Could all matter in a black hole be actually only on its surface (Schwarzschild radius)?

Layman here, sorry if I miss something obvious. Black hole entropy depends linearly on its surface. If all matter in a black hole would actually be located only on its surface (or very near), wouldn'...
1
vote
3answers
2k views

Time paradox inside a black hole

At the event horizon of a black hole, time and the spatial direction toward the center exchange places. The direction inside the black hole from the event horizon to the the singularity in the center ...
-1
votes
1answer
94 views

Does the twin paradox ensure the quantum unitarity near a black hole?

A quantum system of two entangled particles is located near a black hole, particle A is receding from and particle B is moving towards the event horizon. When particle B is crossing the event horizon,...
1
vote
2answers
231 views

Free falling observer's description of object falling past the event horizon

I know that to a hypothetical observer infinitely far away from the black hole (sometimes known as the Schwarzchild observer), all in falling objects appear to "slow down and asymptotically freeze" at ...
6
votes
0answers
283 views

Aren't black holes required to exist forever in our frame of reference?

I know that for an observer far away, nothing ever crosses a black hole horizon (due to time dilation), while in the frame of reference of a falling observer the horizon is nothing special on its way ...
1
vote
3answers
514 views

Practical time travel: time dilation above the event horizon [duplicate]

Imagine there is a huge black hole with very small gravity gradient so that one doesn't get killed by spaghettification after even nearing the event horizon. Now imagine a very curious creature ...
13
votes
6answers
767 views

What would be the view like from inside a black hole looking towards the event horizon?

Ignoring the fact that we would be torn apart by gravitational gradient and assuming we get some time to make some observations before hitting singularity, what would we see looking towards the event ...
2
votes
1answer
227 views

Can you shine a laser on an object that has fallen into a black hole? [duplicate]

I've been having a small back and forth on another website about the nature of objects that fall into black holes. I know that they never reach the event horizon from the perspective of a distant ...
5
votes
1answer
103 views

Does the maximally-extended Schwarzschild horizon see the entire past of the parallel universe?

I've seen similar discussions for the inner horizons of Kerr and Reissner-Nordstöm metrics, but I've never seen mention for the simple maximally extended Schwarzschild geometry: As an infalling ...

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