John Ferrell wrote:
> The following link addresses an instance of radiation traveling faster than the speed of light.
> "Cerenkov Radiation comes from particles traveling at a speed greater than the speed of light in the medium in which they are moving."
> 
> http://smthop.com/articles1details.asp?NewsNum=805
> 
> There are other instances that I have run across that do not accept the speed of light as a limit.
The limit is the speed of light in a vacuum, which is a constant, c. The 
speed of light in any other medium can be exceeded (as it is variable), 
it is the speed of light in a vacuum that can't. Exceeding the speed of 
light in a medium will cause nifty effects like Cerenkov Radiation, but 
it's certainly possible and commonplace around certain radioactive 
materials.

Also, moving faster than the speed of light in a vacuum is supposedly 
possible (the mathematics allow for it), it's just crossing the boundary 
of the speed of light (both ways) that isn't.


-- 
Hector Martin (hector@marcansoft.com)
Public Key: http://www.marcansoft.com/marcan.asc

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