The Solar System for Kids (4th Grade Science)
Fourth graders map the neighborhood: eight planets in order from the Sun, what makes rocky planets different from gas giants, why planets orbit, and how day/night and seasons come from motion.
Sample practice questions
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Which planet is closest to the Sun?
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Mercury.
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What force keeps the planets orbiting the Sun?
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Gravity.
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Is Jupiter a rocky planet or a gas giant?
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A gas giant — the largest planet in our solar system.
Parent tip: "My Very Excellent Mother Just Served Us Noodles" still works for planet order — better yet, have your child invent their own mnemonic.
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