How does a solar system differ from a galaxy?

Solar Systems contain one star in which planets orbit around it, as galaxies contain more than 100 million stars depending on what category it is. Solar systems have a Sun in the centre while galaxies have black holes in the centre, and galaxies contain dark matter in them while solar systems don't.

Explanation:

A solar system contains one star around which planets orbit, where as a galaxy can contain from a 100 million to over a trillion stars. Solar system consists of a Sun at its centre, where as a galaxy usually has a black hole at its centre. A galaxy can contain dark matter where as the solar system does not

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