Huge galaxy at 800 million years away from the 'big bang'

In article ,
"Tony" writes:
In static, non-expanding Universe (thus no redshift, we measure
distance in some other way) the light from the object 13.7 billion LY
away, that we see today, is the light that left that object 13.7
billion years ago. Thus the object is at least that old.

This seems slightly confused. Let's consider a galaxy at z=6.5, the
original topic of this thread. The Universe (with now-standard
parameters) was 0.9 Gyr old when the light we see now left the
distant galaxy, and that light has taken 12.8 Gyr to reach us.

If we could somehow directly measure the distance of that galaxy now
(which would require communicating with observers lined up along its
path, i.e. a project that would take several billion years to
accomplish), we would find it to be 21.1 billion light-years. This
is known as the "proper distance." The proper distance from the
galaxy to us when the light was emitted was 21.1/(1+6.5) = 2.8
billion light years. The difference is how far the galaxy has moved
relative to us while the light was in transit.

All calculations from Ned Wright's marvelous Cosmology Calculator
http://www.astro.ucla.edu/~wright/CosmoCalc.html
using H_0=71, Omega_M=0.27, flat Universe.

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Steve Willner Phone 617-495-7123
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