The end of the world is an event that has worried humanity since ancient times. Scientists estimate that the universe will indeed die someday. The moment will come when all the stars in space will burn out, and there will be no matter left for the birth of new ones.
A star is the main structural unit of the Universe; the entire planetary system is formed around it. A star gives warmth to all objects around, without it life is impossible.
Cosmic luminaries are born from clouds of interstellar gas that collapse due to gravitational instability. During its life cycle, the star will burn all the matter of which it consists in thermonuclear reactions and emit it back into space. These «clippings» will re-gather into the cloud and serve as the basis for a new star.
However, part of the matter cannot become a new luminary. At the end of its life cycle, the star does not disappear completely, but transforms into a white or brown dwarf, a neutron star, or a black hole. The substance that composes them can no longer turn into a new star.
Thus, there is a limited amount of interstellar gas in space, which is gradually decreasing. It means that
Cold luminaries and black holes are not the final stage in the existence of space. After the stars stop emitting heat, even the last objects in the Universe will begin to disappear.
White and brown dwarfs will explode first. It will be a real fireworks display of white dwarfs exploding one after another. True, there will be no one to enjoy the light show. By that time, all living things in the Universe will die from the cold.
After that, even objects that previously only absorbed matter — black holes — will begin to disappear. This will happen as a result of Hawking radiation, that is, the emission of elementary particles into the surrounding space. So black holes will lose all their substance and evaporate.
Ultimately, the universe will only consist of photons, electrons, quarks and other elementary particles.
However, astronomers remain optimistic. In addition to constant expansion, the Universe may begin to contract and then a new Big Bang will occur, which will serve as the birth of a new world.