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4-1 The solar system has two broad categories of planets orbiting the Sun: terrestrial (Earthlike) and Jovian (Jupiterlike)
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4-2 Seven large moons are almost as big as the inner, terrestrial planets
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4-3 Spectroscopy reveals the chemical composition of the planets
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4-4 Small chunks of rock and ice also orbit the Sun: asteroids, trans-Neptunian objects, and comets
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4-5 The Sun and planets formed from a rotating solar nebula
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4-6 The planets formed by countless collisions of dust, rocks, and gas in the region surrounding our young Sun
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4-7 Understanding how our planets formed around the Sun suggests that planets around other stars are common
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