Which scientific term best matches this description: Large planet composed mostly of hydrogen and/or helium?

A) solar system

B) gas giant (Jovian planet)

C) asteroid

D) astronomical unit (au or AU)

Answer: B

Explanation: A large planet composed mostly of hydrogen and/or helium. These planets, like Jupiter and Saturn in our solar system, don't have hard surfaces and instead have swirling gases above a solid core.

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