M. : True, 1948. — 20s. In our lecture, we will present the latest data on the structure of the universe. These achievements, obtained as a result of the hard and intense work of our scientists, the entire Soviet country, the entire Soviet astronomy, have a right to be proud. What is the Universe? In the broadest sense of the word is the whole world around us, that is, all nature, including the smallest particles of matter studied by physicists, and the largest star systems studied by astronomers In the usual sense of the word, we call the Universe an interacting and developing set of celestial bodies - planets, star systems and, finally, "systems of star systems". What is the Universe . Interstellar Distances and Movements of Stars . Luminosity of stars . Star Temperatures . Masses, sizes and densities of stars. Galaxy - giant star systemDark and light nebulae. Structure of the Galaxy . Sources of stellar energy . The structure of the galaxy. Other Galactic Star Systems