Why Jupiter's gravity stopped a planet from forming — simple explanation for a 7-year-old

Child-friendly rephrase explaining how Jupiter's strong gravity kept nearby space rocks from joining to form a planet, so they stayed apart and became the asteroid belt. Perfect for a 7-year-old.

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Jupiter's big pull kept the nearby space rocks from sticking together to make a planet.

Because they couldn't join, the rocks stayed separate and became the asteroid belt.

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