[en] Results of investigations of gamma radiation of the Galaxy in the energy range of 50-5000 MeV, are discussed. The total Galaxy luminescence in gamma rays for energies above 100 MeV is 5x10³⁸ erg/s and is concentrated in a narrow band of +-10 deg from the galactic equator. The central part of the Galaxy in the longtitude interval l=+-60 deg from the Galaxy centre is singled out in the distribution of the intensity of gamma radiation along the galactic equator. The main part of gamma radiation (almost 90%) is made by the continuous component. The dependence of the volumetric luminescence of the galactic substance on the distance to the Galaxy centre is calculated according to the distribution of gamma radiation in longtitude and lattitude. A considerable increase in the gamma radiation density in the region of the Large Galaxy Ring is found which is almost completely explained by a high concentration of molecular hydrogen. The problem of cosmic ray origin is considered. The preference is given to the galactic model. The important problem of the correlation of different components of cosmic rays requires more through measurements of the energetic spectra of gamma radiation, first of all, in the energy range of 10-50 MeV