All Questions
15
questions
1
vote
1
answer
188
views
Can photons form a black hole?
Can photons form black holes the same way as other matter? If there happens to be enough of them concentrated in an area of space so that enough energy exists within a radius to form an event horizon, ...
- 113
0
votes
0
answers
35
views
Photon Sphere Planck Recalibration
Say a black hole's Schwarzchild radius is equal to the Planck length then a horizontal formula can be established as
$A = 4\pi \ell^2$
[1]. I've tried to find an analogue of this set up online but can'...
2
votes
3
answers
422
views
Do light particles have thrust? [duplicate]
I understand that nothing is faster than light and that it can not escape a black hole. However, light particles may be fast, but perhaps it can't escape a black hole due to it's lack of thrust power? ...
- 37
1
vote
2
answers
106
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The effect black holes have on light
We all know that light loses its energy when it is moving through expanding space and time. And sense a black hole can be summed up to a super compressed space time, shouldn't that mean that a photon ...
1
vote
1
answer
131
views
In theory (because light can still enter a black hole) if you are inside of the event horizon, could you see outside of it? [duplicate]
To my limited knowledge, it should be possible for you to see from inside of a black hole. Is this true, or am I missing something?
0
votes
2
answers
110
views
Regarding the radial motion of photons
Photons move on null geodesics and the equation of motion on equatorial plane after some algebra can be written as
$$e^{\nu}\dot{t}^2-e^{-\nu}\dot{r}^2-r^2\dot{\phi}^2 = 0$$
$\phi =0$ for the radial ...
- 3,464
0
votes
1
answer
37
views
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
-2
votes
2
answers
93
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If black hole sucks in all masses, why does it suck in light if it is a form of energy (energy does not have mass)? [duplicate]
I have been searching for a long time for the answer.
1
vote
1
answer
55
views
Is it possible for light to fall into a geo-synchronous orbit around a sufficiently massive planet?
Is it possible for (visible) light to fall into a geo-synchronous orbit around a sufficiently massive planet?
Can a planet or heavenly body be massive enough for it to happen?
What will that ...
- 171
-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?
- 43
0
votes
1
answer
171
views
Antimatter and annihilation of light and black light
Can we annihilate a photon with an opposite phase? As two photons annihilate to give two antimatter photons (with opposite charge), these photons must have some opposite property. When these opposite ...
6
votes
1
answer
298
views
If there is a super massive black hole at the center of our galaxy then why is the center of our galaxy so bright? [duplicate]
Below is our galaxy, if there is a such a massive black hole at the center then wouldn't it suck in any light traveling above it, or is the amount of light put out by stars near the center so great ...
- 835
1
vote
0
answers
67
views
Blackhole and light [duplicate]
I was talking with my friend about blackholes and I asked him "Why blackhole 'sucks' the photons?"
He had no deeper understanding so he answered that "I dont know, may the light is affected, because ...
- 119
4
votes
2
answers
8k
views
If photons have no (rest) mass, why would black holes attract light? [duplicate]
I was told that photons have no (rest) mass. However I thought that black holes are called "black" because no light can go escape the gravity force in their vicinity. I somehow think that, if light is ...
- 143
10
votes
1
answer
3k
views
What happens to light that falls into a black hole?
When light enters a black hole, what happens to it?
I imagine the photons will either fall into the singularity, or the light will orbit just inside the event horizon indefinitely.
(Some background ...
- 826