This illustrated encyclopedia sets out to explain how the Universe works and to describe every feature. It covers the discovery and explanation of the universe from the Ancient Greeks - who thought that the night literally had a thousand eyes sewn onto a mantle by the celestial nightwatchman Argos - up to the present day understanding of black holes, worm holes and the theoretical development of time machines. The book is designed to bring all the history and concepts to life providing an up to date explanation of how the universe works. The book is divided into eight main chapters: Explore the Universe; History of Astronomy; Laws of Time and Space; Quantum Mechanics; The Past, Present and Future of the Universe; What's in the Universe and Watching the Sky; Space Exploration; and a Reference Section.