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Blackholes - Time Distortion And Rotation Link?

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Posted by Alan Read on April 25, 2002 14:30:34 UTC

I am not a scientist, so accept my appologies if the questions are naive. I am interetsed in the fact that their is some belief that time distortion may occur when an object of significant density and size rotates rapidly in space.

I have read about the speed at which neutron stars rotate and the density of these objects and presumably thay would therefore produce some measurable effect, therefore I expect that the effect of a rotaing blackhole would be to an order of magnitude greater.

I have two questions:

1. How fast do black holes rotate? and
2. To what extent does this effect the observable characteristics of blackholes? i.e. how much time distortion occurs because of their density combined with their rotation and does this begin to account for the fact that to all intents and purposes they seem nolonger too exist in this universe. (I am aware of the radiation at the borders of the singularity sic Steven Hawkins etc)

On a seperate note can anyone tell me how light actually manages to pass through solid objects to varying degrees. Is it detroyed and re-created at each step of the way through the medium i.e. does the photon that enters the medium re-emerge unchanged from the other side or has some form of transition taken place. (Wrong forum so just point me in the right direction please.)

Alan.

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