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From: James Mclean <jmclean@chem.ucsd.edu>someplace
Consider a cosmic background photon which was originally emitted
which I'll call 'there', and is just now getting 'here'. Say thisphoton
comes from an event that was 10^10 years ago. How far apart were'here'
and 'there' when the photon was emitted? How far apart are 'here'and
'there' now? If space has been expanding, it's not clear to me thatthe
answer to either question is 10^10 lightyears.