To try to understand the nature of the Solar System, its origin, and its evolution, it is indispensable to consider it in its context, that of a universe in expansion, consisting of stars and galaxies. First, it is necessary to establish the distance scale that allows us to place the Solar System within its immediate surroundings: the nearby stars and galaxies, and the Local Group. Second, we briefly describe the universe at we view it today: the Big-Bang model and primordial nucleosynthesis; galaxies; stars and stellar nucleosynthesis; stellar formation; and interstellar medium.

The Solar System's origin and evolution are best understood by placing it within its context, a universe in expansion, consisting of stars and galaxies.

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The Solar System Within the Universe

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