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David Bowman has this wonderful bent of giving vivid and compact overviews
of the issue ...
Indeed, I find myself wondering what measurement can distinguish between a
distant galaxy's fleeing ours (*into* space) with some Doppler velocity and
a "stationary" distant galaxy with the space expanding between us and it.
Is there any more than the Hubble Red Shift? And why can't a distant galaxy
have a velocity within the Universe *and* the space of the Universe expand?
How can I tell the difference? I wonder if this is a meaningful question. (:-)
4) The luminous matter of the universe is hierarchically
arranged in a fractal arrangement whose Hausdorff dimension
is less than 3 so that the sources of light are a set of
measure zero in space (yielding an average density of zero)
allowing there to be not enough light sources to light up
the sky in most directions.
Now this is new thinking to me. Is this commonly discussed? A bit of a
tutorial would help here -- at least for me -- others??.
Well yes, David, that is why the background is at 3K, but why can we *see*
it?. I think the answer is that, if we assume that c has been constant since
the BB (we don't have much of a choice but to assume this), that space has
been expanding with the Universe (an unnerving thought), and that the
expansion of space has been <c (but what if it hasn't?), then the photons
have had more than enough time to fill the Universe no matter what the
mechanism of the BB.
BUT this doesn't answer for me why I can see quasars (or Q's flashlight) --
which is where we were in the Old Star thread. ...