Coverage of Topics and Study Notes:

As usual the chapter is excellent! 

A suggestion: In figures 26.8 and 9, replace "Distance" or "Size of Universe" with "Average Distance between Galaxies," as the captions suggest. This seemingly minor change keeps you from thinking about an edge of the universe, which would violate the cosmological principal.

Chapter Review: Review and Discussion:All good.

Chapter Review: Conceptual Self-Test: True or False/Multiple Choice: Skip Number 11.

Chapter Review: Problems:  Check out number 6.  You can answer it from careful study of Figure 26.14.