The book is devoted to the study of powerful radio galaxies in different wavelength ranges. The main emphasis is on observational data and their interpretation. The story is told and the prospects for the study of radio galaxies are considered. Describes the properties of these objects, modern physical models that explain their activity and difference. The results of long-term studies of radio galaxies on the program of the RATAN-600 radio telescope, the 6th optical telescope of the BTA of the Special Astrophysical Observatory of the Russian Academy of Sciences and on the VLA NRAO radio interferometer (USA). Tests are analyzed in detail to test models of the Universe on the basis of observational data of radio galaxies. The problems of analysis of relic radiation data in the presence of noises determined by the distribution of radio galaxies. are considered. Postgraduate students, astrophysicists, students-astronomers, physicists and all interested in the issues of modern astrophysics and cosmology .