Rocky planet

Meaning: This means that some planets are made mostly of rock and are smaller than the gas giants. It's like saying, The Earth is an example of a rocky planet in our solar system.

Choice of Words: Rocky refers to something that is composed of rock or stone. Planet refers to a celestial body that orbits around a star. In the context of the story, this sentence refers to the planets that are made mostly of rock and are smaller than the gas giants.

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Related Expressions