Stars are a part of our solar system.

Meaning: Stars are in our solar system.

Choice of Words: The word "part" is a noun that refers to a piece or section of something. "Solar system" is a noun that refers to the sun and the planets, moons, and other objects that orbit around it. "Stars" is a noun that refers to the bright objects in the night sky. The sentence means that stars are one of the many objects that orbit around the sun.

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