Originally posted by swan001
reply to post by TeslaandLyne
I tought that Einstein's Relativity relied on the fact that the speed of light is always constant, no matter the emitter or observer's movements?
Originally posted by subject1145
Originally posted by 11I11
A good thought provoking thread, S&F good sir.
I agree, if light is being sucked into a black hole, it must surely be slowed down by the gravitational pull?
I am not sure if it would be slowed down, or merely not able to escape the gravity of the singularity. Basically spinning at the speed of light but not able to achieve escape velocity and travel faster then the speed of light due to the extreme gravity. Again I have no idea what I am talking about so I'll defer to experts on these subjects.
*reply to post by Tbrooks76
Light only appears to slow down but you have to keep in mind that time also slows down in a strong gravity field so if you where in the black hole with the beam of light your watch would be running so slow that you would still measure light at C.
More to the point, a medium slows the phase velocity of the light wave, but doesn't slow its group velocity.