Book I. and . Perelman introduces the reader to certain questions of astronomy, with its remarkable scientific achievements, tells in a fascinating form about the most important phenomena of the starry sky. The author shows many seemingly familiar and ordinary phenomena from a completely new and unexpected side and reveals their real meaning. The purpose of the book is to unfold a broad picture of the world space and the amazing phenomena occurring in it and to arouse interest in one of the most fascinating sciences, the science of the starry sky. I. and . Perelman died in 1942. during the siege of Leningrad and did not have time to fulfill his intention to write a sequel to this book