Inner Planets: 0-2 moons, Rocky, Small, No rings, Thinner atmosphere, More dense, Discovered in ancient times, More explored, Longer period of rotation (day), Shorter period of revolution (year), Outer Planets: 10+ moons, Gaseous, Large, Rings, Thicker atmosphere, Less dense, Several discovered in modern times, Less explored, Shorter period of rotation (day), Longer period of revolution (year), Both: Orbit the sun, Rotate on axis, Have gravity, Not in the habitable zone, Formed from nebula, Approximately 4.6 billion years old,

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