The book is divided into 16 chapters. First, it introduces what astronomy is, what it does and so on. The book starts with the nearest celestial body, the Earth-Moon system, to introduce astronomy knowledge. Then it talks about the solar system, and gradually moves on to the stellar world, the Milky Way, the extragalactic galaxies, the active galaxies, and the entire universe. The book also provides a basic introduction to research and observation methods in astronomy, as well as a review of the history, events, and figures of astronomical research. In addition, the book also introduces astronomy-related knowledge such as the naming of constellations, extinction of dinosaurs, exploration of extraterrestrial civilizations, and UFOs in the Astronomy Trivia section.