What is the fundamental difference between the theory of the structure and evolution of the Universe from the theory of the structure and evolution of stars and other celestial bodies?
The main role in the evolution of the Universe, galaxies and stars is played by gravitational interaction, but in the early stages of its evolution, weak, strong and electromagnetic interactions played an important role. The universe is infinite or heterogeneous, unlike stars of finite size. The universe is expanding, and a molecular cloud must contract to form a star.
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