Discovering the Shape of Spacetime from the Big Bang: A Scientific Exploration

[denism]

I know that v=H*D. If the Hubble constant was constant, this would lead to an exponential recession.
I understood how H is determined (through the variations of redshifts as fonction of distance). I also see how distances can be determined.
But I don't know how recession velocities are measured? do you knwo?

 

[Chronos]

There are no galaxies residing beyond the surface of last scattering whose photons have not yet reached us. Nothing but hot plasma exists beyond z~1100 [source of the cmb].

 

[Whovian]

Recession velocities are measured via redshift. Research the Doppler Effect to understand why Redshift comes about. We can determine which spectral emission lines we can expect to see in stars of certain materials (I can't remember how,) and see how redshifted the stars are. Plug into our easily derivable formula for the relativistic doppler effect, and we're done.