Col wrote:
Well of course the pressure is 0mb, there would be no atmosphere
at those temperatures 
You know I think somebody once worked out the thicknesss
of solid atmosphere that would form at those temperatures
and it really was very small, IIRC only around 10m or so.
Solid atmosphere? So it would be solid and not a gas or liquid? Does
that really class as an atmosphere?!
Jonathan
Canterbury