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By (user no longer on site) OP
over a year ago
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Reading about black holes. I have always been informed that nothing can travel faster than the speed of light. Light cannot escape a black hole, so the force acting on light pulling it towards the centre of a black hole must be greater than that, ie the gravitational force is stronger/faster than the speed of light no? Random I know, just wanted to discuss. |
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By *VineMan
over a year ago
The right place |
You’re mixing up units. You can’t compare speed to force.
In a black hole gravity is so strong that space time is warped so much that at a certain point (called the event horizon) the speed of light is less than the escape velocity and hence it can’t leave. It’s also why it’s called a black hole.
If you spent ten minutes near the event horizon of a black hole about a billion years would pass on earth. Relatively is weird!!  |
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By (user no longer on site)
over a year ago
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"You’re mixing up units. You can’t compare speed to force.
In a black hole gravity is so strong that space time is warped so much that at a certain point (called the event horizon) the speed of light is less than the escape velocity and hence it can’t leave. It’s also why it’s called a black hole.
If you spent ten minutes near the event horizon of a black hole about a billion years would pass on earth. Relatively is weird!! "
All that happens when I open my legs? 
Blimey  |
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"Reading about black holes. I have always been informed that nothing can travel faster than the speed of light. Light cannot escape a black hole, so the force acting on light pulling it towards the centre of a black hole must be greater than that, ie the gravitational force is stronger/faster than the speed of light no? Random I know, just wanted to discuss."
When talking about relativity things tend to get funky. For instance we know that light is an electromagnetic wave with no mass yet it weirdly has momentum. It's because of this momentum that gravity has an effect on light.
Now all of the fundamental forces have an exchange particle associated with it, and for gravity it's the so far undiscovered graviton. This suggests there is a speed of gravity, but that doesn't necessarily make sense in terms of what you are saying.
Gravity is everywhere in the universe, it is quite literally unescapable as gravitational field reach to infinity. You can be millions of miles from any massive object and still experience its gravity even if you cant feel it.
So with a black hole the light that gets sucked in must be within its event horizon, otherwise it will more than likely escape the black hole, it will just be on a different trajectory. We call this gravitational lensing but that is a whole other rant.
I hope this gives you an answer of sorts. |
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By *aomilatteCouple
over a year ago
Visiting Blackpool |
"Reading about black holes. I have always been informed that nothing can travel faster than the speed of light. Light cannot escape a black hole, so the force acting on light pulling it towards the centre of a black hole must be greater than that, ie the gravitational force is stronger/faster than the speed of light no? Random I know, just wanted to discuss.
When talking about relativity things tend to get funky. For instance we know that light is an electromagnetic wave with no mass yet it weirdly has momentum. It's because of this momentum that gravity has an effect on light.
Now all of the fundamental forces have an exchange particle associated with it, and for gravity it's the so far undiscovered graviton. This suggests there is a speed of gravity, but that doesn't necessarily make sense in terms of what you are saying.
Gravity is everywhere in the universe, it is quite literally unescapable as gravitational field reach to infinity. You can be millions of miles from any massive object and still experience its gravity even if you cant feel it.
So with a black hole the light that gets sucked in must be within its event horizon, otherwise it will more than likely escape the black hole, it will just be on a different trajectory. We call this gravitational lensing but that is a whole other rant.
I hope this gives you an answer of sorts."
This   |
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