The inner planets are small and dense because they formed closer to the Sun, where higher temperatures caused heavier materials like metals and rock to condense. In contrast, the outer planets formed further away, where it was cooler, allowing lighter gases like hydrogen and helium to accumulate and create their massive atmospheres. This difference in composition and distance from the Sun led to the stark contrast between the rocky inner planets and the gas giants of the outer solar system. Engaging in discussion with classmates and teachers can further illuminate these concepts and enhance our understanding of planetary formation.
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