"Astronomy: All That Matters, by leading expert Percy Seymour, is an innovative and intriguing introduction to exciting discoveries and important scientific theory. Each chapter starts with details of a method of how astronomers over time have observed the world, and then uses this as a springboard to discuss what they discovered, and why this was important for understanding the cosmos. The last chapter, on dark matter, also focuses on the many things we don't yet know- reminding us that astronomy, like this book, is a fast-paced and fascinating subject"--Back cover.