The burning out of hydrogen in stars leads to a decrease in its content and the gradual accumulation in galaxies of heavy chemical elements. In the conditions of the eternal existence of the Universe in galaxies there must be reverse processes that ensure the recycling of the waste of stars. The main product of the work of the relevant mechanisms should be hydrogen with a certain proportion of "metals". The emerging hydrogen, together with an admixture of other elements, contributes to the renewal of the stellar composition of the host galaxy. Its emissions outside the galaxy are already a condition for the creation in the intergalactic space of new stellar islands - small galaxies. Based on the analysis of observational data, galactic processes responsible for the processing of stellar baryon waste are shown. These processes begin with the work of gravitational forces, collecting matter available for processing in the center of the galaxy, and then a central supermassive galactic object can be connected to them. With good luck, a quasar is ignited in the center of the galaxy, which implements the second part of the reverse processes. Modern ideas about the central galactic body do not indicate the possibility of the existence of such processes. And this fact comes from the basic theory, the consequences of which sometimes exceed the capabilities of Nature in their practical implementation. The “painful”, but necessary for physics, revision of its individual positions allows the central supermassive “black hole” to be regarded as a dark Mitchell star - Laplace. The mechanisms associated with the processing of stellar waste, as well as some of the consequences of them. Some of the effects are among the observational data of quasars, and they are given below. But the main evidence - astronomical – is reflected in the second part of the article. It is suggested that the fate of the central body - the supermassive galactic nucleus. Under the conditions of the ever-existing Universe, this forecast indicates extremely rare, but the most ambitious events in the Metagalaxy - explosions in galactic nuclei.