In these chapters we get deep into cosmology, and I find it quite heavy going at times. There are the various models of the universe, based on FRW parameters. From these and some other stuff various things are calculated theoretically. This includes the echoes of the big bang, whether space is curved, how fast the universe is expanding and if it is decelerating or not.
Some of this stuff is ok, some is a bit mind blowing. Lots of calculations that you are lead through to predict things like the proportion of hydrogen to helium predicted by the big bang theories.
Then in chapter 7 it considers attempts to measure the Hubble constant, the Hubble Time, the deceleration parameter, the cosmological constant, and the various density parameters.
My head hurts!