The solar system began as a nebula of dust, ice, gas. They were pulled together by gravity. The sun is a star: energy from nuclear fusion. Gravitational foces balance raditaion pressure. There are millions of stars in the Milky Way Galaxy.
The life cycle of our star is
Sun---.>red giant--->white dwarf--->black dwarf
The life cycle of a larger star is
Larger star(blue giant) ---> red supergiant--->supernova--->neutron star or balck hole
New elements are made in stars by nuclear fusion and spread through the universe by supernova explosions.
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