Russian astronomers believe that the X-ray cloud surrounding our galaxy is due to individual stars. They study the distribution of X-rays in the galaxy and discover that it corresponds to the infrared distribution caused by low-mass stars and black holes. In fact, so far it has been considered that the source of these X-rays was the hot gas that fills the galaxy. But, according to this theory, it would have to be produced in the most supernova galaxy of which actually occur to keep those gas clouds.