All Questions
11
questions
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3
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Is there a frequency limit for the pendulum near a black hole, and is this related to photons and the UV-cutoff?
I imagine a swinging pendulum being held outside a black hole, supported by the normal force of a rocket. The rocket is hovering the swinging pendulum right above the event horizon in the strong ...
- 95
-2
votes
1
answer
65
views
Black holes bending light [duplicate]
Ok so I've been watching some videos about black holes but there is one thing I don't get: how can light be bent by black holes since photons don't have any mass?
- 1
1
vote
1
answer
140
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Why is a black hole referred to as massive? [duplicate]
I am reading Brief Answers To The Big Questions by Stephen Hawking. In the very first chapter he writes,
A typical black hole is a star so massive it has collapsed on itself. It's so massive that not ...
- 121
0
votes
1
answer
99
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Greatest relativistc mass possible for a single photon [closed]
I have been told that photons can not be blue shifted to the point where they become black holes, although a photon with a Planck scale wavelength would also have a relativistic mass equal to a black ...
- 533
-1
votes
1
answer
175
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Why doesn’t light escape a black hole? [duplicate]
When an object is squeezed to its Schwarzschild radius it becomes a black hole (made by density) and its mass does not change (its gravity doesn’t change), but if its mass doesn’t change (its gravity ...
0
votes
1
answer
37
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Pulling of Light by a Black Hole? [duplicate]
We all know that light has no mass at all. Yet we say that the gravitational pull of a Blackhole within Schwarzschild radius doesn't let light to pass. If the light has no mass, how can it experience ...
- 33
-3
votes
2
answers
234
views
If gravity of the Earth is so strong and pulling the moon [closed]
If the gravity of the earth is so great that it is pulling the moon, then why aren't we - humans - so strongly attracted to earth that we can't even lift ourselves up?
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0
votes
2
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3k
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How does a Black hole attract light? [duplicate]
Please no hate for lack of knowledge:
I am somewhat fascinated with the subject of black holes. However, I do not understand a concept which is constantly attributed with black holes: that a black ...
- 145
3
votes
2
answers
3k
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Why do photons add mass to a black hole?
Why do photons add mass to a black hole?
When photons are taken irreversibly into a black hole does the mass of the BH increase?
- 1,241
4
votes
2
answers
2k
views
What happens to a photon in a black hole?
Assume a photon enters the event horizon of a black hole. The gravity of the black hole will draw the photon into the singularity eventually. Doesn't the photon come to rest and therefore lose it's ...
- 624
2
votes
3
answers
371
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Formation of black holes
If stars start with a finite density and light can escape from them, how can they be compacted to form a mass with infinite density which light cannot escape? The black hole will have the same mass as ...
- 21