About the book: 2020 / The book contains 181 problems, 50 questions and 319 tests with answers and solutions. The material is mostly new, but includes the most successful tasks from previous editions. In general, these are not very difficult, but “creative” tasks that reveal different aspects of modern astronomy and cosmonautics and require creative thinking and understanding of the subject. The basis for some questions was literary works, including science fiction stories by the Strugatsky brothers. Working with this book makes knowledge of astronomy and astronautics active, which is important for future scientists and engineers, as well as teachers of physics and astronomy.