Inner Planets: made of rock, smaller sizes, more dense, closer to the sun, few moons, shorter year length, warmer temperatures, BOTH Inner & Outer Planets: travel around the sun, sphere (ball) shaped, smaller than the Sun, Outer Planets: made of gas, larger sizes, less dense, farther from the sun, many moons, longer year lengths, colder temperatures,

4.01 Grouping Inner vs. Outer Planets

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