On 28 Mar 2006 00:10:41 -0800, in uk.sci.astronomy ,
wrote:

You can make the end of a light beam sweep along a screen at any
arbitrary speed though - but nothing physical is actually moving faster
than the speed of light. Same with a very narrow angle pair of scissors
the crossing point can be made to advance at c (at least in
principle).

Er, no it can't. The classic mistake is to apply non-relativistic
equations of motion.

Mark McIntyre
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