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Learn about the Astronomical Unit, Inner Planets, and Outer Planets. Discover the differences between solid Inner Planets and gaseous "Gas Giants" located beyond the Asteroid Belt.
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Astronomical Unit • An astronomical unit is a unit of distance equal to the distance between the sun and the Earth. • Abbreviated AU
Inner Planets • The four planets closest to the sun • All are solid, rocky
Outer Planets • The four planets furthest from the sun, past the asteroid belt • All are gaseous, “Gas Giants” • All the outer planets have rings!