Most scientists believe the universe was created by a 'Big Bang' about 13 billion years ago
At first the universe was a hot glowing ball of radiation. In the first few minutes, the nuclei of the lightest elements formed. As it expanded, over millions of years, its temperature fell. Uncharged atoms were formed
Eventually dust and gas were pullet together by gravitational attraction to form stars. The immense heat started nuclear fusion in the stars, so visible light was emitted.
Gravitational forces increased as the stars increased in size, and dusts and matter was attracted to them, and this may have been how planets formed
Large groups of stars are called galaxies. The sun is one of the many billions of stars in the Milky Way galaxy. There are billions of galaxies in the universe
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