[longshadow]

Thanks.

No charge..... but there will be a pop quiz tomorrow!

BTW, there is no value of z (redshift) for which the recessional velocity is equal to "c." That's because if the emitter were receding from us at v=c, the redshift would be infinite, and the photons would have no wavelength at all! Basically, we can't see anything that's receding that fast (or faster). That's what defines the limit of the visible Universe, the space inside of that limit is known as the Hubble volume.

So, in the limit, as z -> infinity, v -> c.

[PatrickHenry]

BTW, there is no value of z (redshift) for which the recessional velocity is equal to "c."

A universe has gotta know its limitations.
-- Modified saying from Dirty Harry

[RadioAstronomer]

:-)