All Questions
26
questions
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When it comes to getting closer to the Schwarzschild radius, how is discrete a limit?
From Keeton (2014) in Principles of Astrophysics: Using Gravity and Stellar Physics to Explore the Cosmos, Gravitational time dilation near a large, slowly rotating, nearly spherical body, such as the ...
1
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1
answer
106
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Is it possible that the mass of a black hole is located at the event horizon?
Due to gravitational time dilation, an object falling into a black hole appears to slow down as it approaches the horizon, never actually reaching it. If it were to somehow enter the event horizon, ...
1
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1
answer
69
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How would a clock with hands behave if half of it is outside a black hole and half inside? [closed]
I am thinking of a clock moving close to the speed of light at a tangent to the event horizon so it doesn't fall in instantly Would the time like spacetime inside the black hole be reflected in the ...
user355436
2
votes
0
answers
133
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What would an observer inside of a collapsing shell observe?
What does and observer inside of a collapsing shell observe? Lets say we have a shell of matter collapsing to a black hole. What would observers near the center see? How would the rest of the universe ...
- 2,908
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0
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33
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How does time warp at the midpoint between 2 equal mass black holes? [closed]
Assuming large masses and 1km between event horizons.
Is time very slowed? or what?
I am making a video game that is approximating relativistic effects on time near massive bodies. I am not concerned ...
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2
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0
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50
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Given the time dilation at the event horizon plus black hole evaporation, can anything really ever enter a black hole? [duplicate]
There are many thought experiments about what it would be like to fall into a black hole, spaghettififaction, the singularity at the center and so on. But to me it seems that no object could actually ...
1
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1
answer
64
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Would this method work for generating sustained arbitrarily high time dilation in the center?
Let's say we have a series of a large number of spherical shells.
Each shell has twice the mass and radius as the last.
There may be thin poles or ropes to make sure inner shells don't move around.
...
- 2,908
2
votes
2
answers
634
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What is the frequency of the light seen by an observer free-falling into a black hole?
My question is similar to many others, Infalling light signals seen by a free falling observer for instance, but I have not seen it addressed exactly as I want to ask it.
It is clear for me (I am ...
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1
vote
4
answers
813
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Wrist watch close to a black hole
The article in the source below says,
"As you get closer to a black hole, the flow of time slows down..."
I am trying to understand this whole time slowing down with the following thought ...
- 183
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3
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277
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Will two successively infalling observers meet at the event horizon?
Alice is radially free-falling towards a black hole. 1000 years later, Bob is following her, also free-falling. Will he meet Alice at the event horizon?
The problem is that from the point of view of a ...
- 3,155
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39
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Does it really take an infinite time to reach a Black Hole's event Horizon? [duplicate]
Does it really take an infinite time to reach a Black Hole's event Horizon.
The forumla for gravitaional time dialation is.
$$t_0=t_1\sqrt{1-r_s/r}$$
So I used wolfram alpha to calculate the time that ...
- 2,908
1
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0
answers
64
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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
1
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1
answer
211
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Does someone falling into a black hole see the outside universe moving faster?
Similar questions have been asked twice before, and gotten two completely different answers:
Time dilation when falling into black hole - Answer is a definitive 'no'
Does someone falling into a black ...
1
vote
1
answer
105
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Computing in Kruskal coordinates
In my last question I learned that movement inside event horizon is actually well defined when represented in Kruskal coordinates.
However, I still don't understand how it is working out. Can you help ...
- 302
0
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2
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274
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Shouldn't it be impossible to fall into a black hole? [duplicate]
Imagine that you, unfortunately, fell into a black hole. For external observers, you would slowly go closer and closer to the event horizon. Then, when you reach the event horizon, you would appear to ...
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