A. How do outer planets differ from inner planets?
B. They consist of a mixture of gases and liquid.
The outer planets, also known as gas giants (Jupiter, Saturn) and ice giants (Uranus, Neptune), differ from the inner planets (Mercury, Venus, Earth, Mars) in several ways, including their composition. The outer planets are larger, mostly composed of gases and liquids, and have rings and many moons, while the inner planets are smaller, rocky, and have solid surfaces.