[...]
 >  Hi there Jack,
 >  At 0.9c, any wavelength of light would be red-shifted  by a factor
 > of 4.4. Thus the most sensitive colour (yellow-green) at 5.6*10^-7 m
 > emitted from this object moving away from us, appears  to have a
 > wavelength of 2.4*10^-6 m which is in the infrared part of the
 > spectrum.   Your eye would not see it.
 > However other instrumentation could.  There are object moving away
 > from use faster than 0.9c, however they are beyond the particle
 > horizon.  The particles horizon is caused by the finite age of the
 > universe.  Light has had only 15 or so billion years to move about
 > but the universe is far far larger than 15 billion years...Ets
 > beyond the particles horizon?  Completely possible, how they could
 > never have reached us.
This seems to imply that our universe may be much larger then
previously thought.
js
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