What this book is not, 1) a text book or 2) detailed explanation of Astrophysics.
What this is a history of Astronomy for the last 40 years.
Richard Panek is a journalist and this book is a detailed account in the personalities in Astronomy for the last 40 years that lead to the ideas that we can see only 4% of the Universe and how we see inflation.
Given that i've been out of school for 30 years my math can't follow the detailed cosmology text book but this book provides a clear reasoning why we believe the universe is accelerating and the problems that provides for theatrical physicists. If you love Astrophysics/Cosmology books give this a read.
I've read and re-read Dr Greene previous books several times because their dense and the concepts are difficult but the underlying ideas are fascinating. The idea of parallel universes is just plain strange but as pointed out in this book it just keeps popping up. Don't read this book unless you read his previous book because is more a compendium of newer ideas and the fringe.