How does Ferris structure his nonfiction book, Coming of the Age in the Milky Way?

Ferris sturctures the book, Coming of the Age in the Milky Way, is separated into three main sections. Part One: Space is separated into eleven chapters and describes the early development of astronomy through classical physics. Part Two: Time has three chapters and deals with the age of the universe and the evolution of atoms and stars. Part Three: Creation covers quantum physics and the origin of the universe.