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The Solar System. 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. Asteroid Belt. Outer Planets.
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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!