All Questions
16
questions
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Observing an event horizon while approaching one
A thought crossed my mind that I realized was hard to conceptualize so I decided to simplify the question by putting it in terms of event horizons.
If I am an observer approaching black hole "A&...
- 101
3
votes
1
answer
52
views
Gravitational time dilation and power beaming
Consider this thought experiment that kept me awake for far too long last night.
Two spacecraft are located near a black hole, and their relative positions are such that, due to the gravitational time ...
- 33
0
votes
1
answer
68
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What determines intensity + range of a gravity field?
Related questions..
How does the Sun's gravity extend out millions of miles to influence the far reaches of our solar system?
Reference: movie - "Interstellar", 2014 Nolan) / How does a ship ...
- 55
1
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0
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135
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How would an Alcubierre warp bubble be affected by external gravitational fields (e.g. black holes)?
Consider a spaceship inside an Alcubierre warp bubble traveling in a straight trajectory. As it travels, it passes near a black hole (for the sake of argument, we'll say it's near the event horizon of ...
- 111
-1
votes
1
answer
107
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When a black hole explodes due to hawking radiation, how does the curvature of space previously within the event horizon behave?
I'm thinking about the time dilation in terms of distance from the singularity, to the event horizon and outside it.
After a black hole has lost its necessary mass to maintain its singularity through ...
- 133
2
votes
2
answers
216
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Time dilation, and curvature of space caused by two black holes of unequal masses
If you were to try to find the time dilation in a region of space near a black hole you would use the equation
$$t_r=\sqrt{1-\frac{2GM}{rc^2}}$$
Would the time dilation from two black holes be this?
...
- 780
2
votes
2
answers
546
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Can a sufficiently large black hole have low time dilation near its event horizon?
First time posting here, please let me know if I miss anything!
As I understand it, as the mass of a BH increases, its Event Horizon increases more than the rate of the mass being put in. In ...
- 141
1
vote
1
answer
209
views
Time dilation near a black hole
If an Object exists near a black hole where 1 hour of its time is observed by a distant observer as 10 hours, then is total amount of light emitted by Object (in that one hour) toward the distant ...
- 11
1
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0
answers
28
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Can one observe a blackhole grow from outside its event horizon? [duplicate]
For an observer outside Black hole's event horizon nothing ever falls into the black hole .
So if the observer waits for an eternity outside a super massive blackhole feeding on gas , will the ...
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1
vote
3
answers
193
views
If a planet orbits around a black hole, would the time elapsed at near side slower than at far side?
Suppose a planet is orbiting a black hole, is it true that the time elapsed at the side that face to black hole is slower? Because I think the near side is nearer to the black hole, so it experienced ...
- 917
3
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0
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176
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If it takes infinitely long for someone to fall in a black hole, wouldn't it evaporate first? [duplicate]
Let's say I decide to jump into a large black hole. A distant observer never sees me enter the black hole, but he does see the black hole evaporate. According to this reasoning, I would then keep ...
- 2,172
1
vote
1
answer
254
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The age of black holes
I have a very small understanding of space-time however I have been watching some interviews and reading articles featuring theoretical physicist Kip Thorne and I have a few questions that I hope can ...
- 11
4
votes
2
answers
337
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What are the photon/electron consequences of matter in a gravitational time dilation?
So I saw the movie Interstellar, and it got me thinking. I won't even mention all the plot holes, but I wanted to ask about a planet orbiting a black hole. I always thought you had to travel near the ...
- 213
1
vote
0
answers
134
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How can matter reach the singularity of a black hole if time stops at the event horizon? [duplicate]
Black holes are said to be composed of two parts:
A singularity at the center, where all the mass of the black hole is condensed in a point of zero volume.
A black and empty ball delimited by the ...
- 1,613
2
votes
1
answer
1k
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What is the largest disparity of gravitational time dilation from earth's that life can survive?
In certain theoretical scenario's a human can be in a gravitational field where he would age half as fast as on earth's surface.
However, for light to travel half as fast in one direction, we are ...
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