With his best-selling astronomy textbook, HORIZONS, author Mike Seeds helps you understand your place in the universe-not just your location in space, but your role in the unfolding history of the physical universe. To achieve this goal, he focuses on two central questions: "What Are We?," which highlights your place as a planet dweller in an evolving universe, guiding you to better understand where we came from and how we formed, and "How Do We Know?," which provides insights into how the process of science can teach us more about what we are. Each new copy of the text includes access to ThomsonNOW?, an online personalized learning system that will save you time in studying and help you prepare for exams through a series of diagnostic tests and personalized study plans.