The Inner have small amounts of moons, while the Outer have many moons. Another difference is that Outer planets have rings, and Inner planets do not. The Inner planets orbit the Sun quickly, while the Outer orbit slowly. This is why years are different for the Inner and Outer planets.Click to see full answer. Also know, what are the similarities of the inner planets?All of the inner planets are solid, dense, rocky planets. The inner planets either do not have moons or have just one (Earth) or two (Mars). None of the inner planets have rings. Compared to the outer planets, the inner planets have shorter orbits around the Sun, but all the inner planets spin more slowly. how are planets similar and different? The inner planets are all small, no moons and no rings. Outer planets [Jupiter, Saturn, Neptune and Uranus] are big gas giants and have many rings. The planets are alike because all the planets are made up of the same things like rocks and ice. All of the planets are also alike because they all orbit something. Moreover, what do outer planets have in common? The four outer planets have faster orbits and spins, a composition of gases and liquids, numerous moons, and rings. The outer planets are made of hydrogen and helium, so they are called gas giants.What separate the inner and outer planets?The four planets furthest from the Sun are known as the Outer Planets, or the Gas Giants. These planets are Jupiter, Saturn, Uranus and Neptune. Separating the Inner Planets from the Outer Planets is the Asteroid Belt, a region of thousands of asteroids in orbit of the Sun between Mars and Jupiter.

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