Gas giant

Meaning: This means that some planets are much larger than others and are made mostly of gas. It's like saying, Jupiter and Saturn are examples of gas giants in our solar system.

Choice of Words: Gas refers to a state of matter that is neither solid nor liquid. Giant means something that is very large or powerful. In the context of the story, this sentence refers to the planets that are made mostly of gas and are much larger than the terrestrial planets.

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Related Expressions