On Sat, 16 Oct 2004, Russell McMahon wrote:

>> Albert's relativity theory wouldn't agree with you at all.
>
> Correct. but a laser could be used as a "light drive" simply by "throwing 
> photons out the back".

Still, what would an observer looking at the ship from behind see ? 
Nothing ? Frozen photons ? Bits of mass ? Also if the photons would be 
redshifted seriously their energy would be near zero. Wp = h*mu with mu 
tending to zero for this case. So *what* is a slow (extremely redshifted) 
photon anyway. Radio frequency ? Audio ? Vlf ? DC ?!!!

Peter
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