The outer planets are called Jovian planets because they are similar in composition and appearance to Jupiter, the largest planet in the Solar System. The Jovian planets are primarily composed of hydrogen and helium, with small amounts of other gases and elements. They are also characterized by their large size, thick atmospheres, and strong magnetic fields.

The Jovian planets include Jupiter, Saturn, Uranus, and Neptune. These planets are all located beyond the asteroid belt, which is located between Mars and Jupiter. Jupiter and Saturn are the two largest planets in the Solar System, and they both have extensive systems of moons and rings. Uranus and Neptune are the two outermost planets in the Solar System, and they are both known for their unusual atmospheres and magnetic fields.

The Jovian planets are an important part of the Solar System, and they play a significant role in our understanding of the formation and evolution of the Solar System. By studying the Jovian planets, we can learn more about the processes that shaped our Solar System and how it has changed over time.