John Graeme wrote:
The "speed" of the CMBR, in units of comoving distance over cosmological
time, is much larger than the speed of light. I think it's about 3.2c.
This means essentially nothing, since the speed of light has no special
status when talking about cosmological recession velocities.

-- Ben

I'm not sure I understand: Does that mean that there are portions of
the universe that we can never see because they are in effect moving
away from us faster than the speed of light? I thought that was
impossible--that the light just got more red-shifted at greater
distances.

Yeah, the light speed limit is only the limit of matter or energy
*moving* inside space. There is no such speed limit when it comes to
how fast space itself grows or shrinks inside itself. I always throught
of it like a bunch of boats in water, if the boats have a maximum speed
of 10 knots, then there's nothing that says you can't have a 20 knot
current in the water which moves them faster. Think of the boats as
matter or energy, and think of the water as space.

Yousuf Khan