yeah, i remember that.
Does light only travel at one speed?
- Thread starter Megahurtz400
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yeah, i remember that.
It has been explained.
In a black hole all paths lead inwards. It doesn't matter what speed light is moving, it can only ever go inwards. Imagine it as being a funnel. Pour water into a funnel and it will flow only one way, no matter how fast the water may be moving.
Changing direction may change the velocity of light. It doesn't stop its speed being c.
As for gravitational lensing, again, the speed of light does not change. It just takes on a different path. It doesn't slow down or speed up, but does take longer to reach us, as it has to go further. Scientists have measured this. Read Beta's posts again.
Do you think it's possible to mention Hawking radiation without opening a huge can of worms?
Will it though?
When things move, their size, mass and measurement of time differ from a stationary observer.
So an explosion of such a size would instantly consume us, because with it being a good 10 light years across, we would be smack bang in the center of it.
We could also take the factor that time slows down when you approach the speed of light, so while that light is taking 8 minutes of its own time to reach us, our time slows down making it seem like instant to us.
Who knows if it's right nor not it's just a theory, but don't be so quick to dismiss it because of our concept of the speed of light.
Our measurement of light speed is only that speed because of our size, to some thing much larger, their measurement is a lot faster, the expansion of the universe has already proven that.
No!
Not sure what to post in response to this other than to do some reading on special relativity.
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That's all taken care of within relativity.
That's a common misunderstanding. The everyday use of the word 'theory' is equivalent to 'baseless guess' but in science a 'guess' is an hypothesis (which is usually motivated by circumstantial evidence) and once that hypothesis is tested and found to square with reality then it becomes a 'theory'. There is no higher scientific thing than a 'theory'. The whole "Its only a theory" is trotted out by creationists in regards to evolution. Evolution is a fact, 'evolution by natural selection' is the theory which describes the facts. mavity is a fact, the theory of general relativity is the model which describes the facts about mavity discerned from experiments and observation.
It's possible to upgrade a model from theory to fact because that would imply its completely valid, in all regimes, all situations, all configurations and we cannot test all such scenarios. A theory is a model which has been tested to the limits of our ability and found to accurately predict the observations.
The expansion of the universe doesn't mean the speed of light is different elsewhere. The speed of light is a locally defined thing and the expansion of the universe doesn't alter that. Things which are moving across the cosmological horizon are being carried away from us by the expansion of space such that light they emit isn't moving fast enough to close the gap faster than it expands but the objects themselves are still moving slower than light, they find that light over takes them when they look around.
the gravitational pull of some areas of space can bend light, i wonder if it gets slowed down aswell
It can't and it doesn't.
Light is not bent by mavity. Gravitational lensing is the distortion of space/time, not light. Now i know that logically it seems that light must bend to follow that distortion but it doesn't. As far as light is concerned it is always travelling in a straight line...even if the line itself is wonky