All Questions
33
questions
2
votes
2
answers
245
views
What is the perceived shape of a non-spinning black hole as it is approached at high velocities?
The question and answer at What is the shape of a black hole? states that an event horizon " is indeed a sphere." But if it is approached at high velocity, does the traveler calculate that ...
- 480
5
votes
3
answers
435
views
How does an Object at event horizon stop to the observer?
I have read about an object, that once at the even horizon the object would be seen as stopped to the observer.
So my question is in regards to the light reflection off of the object. If the object ...
- 53
0
votes
1
answer
99
views
How does a black hole's surface area transform relativistically? [duplicate]
Perhaps a bit of a strange question. I know the traditional way of finding a black hole's surface area is through the Schwarzschild radius,
$$
r_{\rm{Schwarzschild}}=\frac{2GM}{c^2}
$$
however, that ...
- 48
8
votes
4
answers
1k
views
A small black hole asymptotically approaches a big black hole's event horizon. Will it seem to be frozen there, or will it seem to merge?
On this site, there are currently two scenarios described:
two black holes merge in a finite time
in any sensible meaning of the term merge the two black holes do indeed merge in a finite, and very ...
- 29k
1
vote
0
answers
64
views
Objects A and B fall into a black hole. B is released 1s after A. How do A and B see each other's trajectories? Esp. when crossing the event horizon?
Imagine we have three observers, A, B and C, all standing on a platform hovering just outside the event horizon of an ideal Schwarzschild black hole$^1$. At time $t=0$, as measured from the platform, ...
- 1,246
0
votes
1
answer
51
views
"Different reality" inside a black hole
why does our perception of space and time entirely change inside a black hole? And why does time not stop inside it from the perspective of the inside observer, however, extremely slows down for the ...
- 27
2
votes
2
answers
288
views
What is the gravitational acceleration inside the event horizon?
Inside the event horizon is a singularity and it has a surface. Given that even light can't escape the pull once the event horizon is crossed, does that mean that anything that crosses the event ...
- 315
2
votes
1
answer
171
views
Do black holes present a contradiction in our understanding of GR? Or... what happens to the observer after infinity? [closed]
There have been some lengthy discussions, here and here (among others), about whether, to the distant observer, black holes form in a finite time or an object falls into a black hole in a finite time. ...
- 204
2
votes
2
answers
188
views
Can black hole experiences Coriolis effect?
The weather here are thanks to Earth's rotation, so would there be any coriolis effect however tiny occurs when black hole rotates?
- 13k
3
votes
0
answers
162
views
Black hole: Infalling matter vs. increase of event horizon
Suppose we have a non-rotating, non-charged black hole and a stationary observer that is not moving relative to the black hole, and some object is falling radially into the black hole.
As far as I ...
5
votes
2
answers
431
views
Blinking flashlight infalling into the black hole, as frequency → ∞
This is my third question from a series were I progressively refine my thought experiment. The others are:
Can something (again) ever fall through the event horizon?
Time of flashlight crossing the ...
- 979
1
vote
1
answer
347
views
How slow can time get near a black hole?
The closer I get to a black hole, does time slow down proportionally?
Does time stop near the event horizon?
- 731
2
votes
1
answer
111
views
What would an external observer see happen to objects entering an evaporating black hole?
As I understand it, objects passing the event horizon of a black hole from their perspective will, from an external perspective, seem to keep approaching but never reach the event horizon. Given this, ...
- 173
1
vote
0
answers
69
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 ...
2
votes
0
answers
37
views
Black Hole Formation Physics [duplicate]
Considering only Black Holes that form due to gravitational collapse since the big-bang, wouldn't it be true that that have not (in our reference frame), in fact, formed a singularity or even much of ...
- 1,809