The Jovian planets are Jupiter, Uranus, Saturn and Neptune. These planets are also called the outer planets and gas giants. In the solar system, these planets are much larger than the terrestrial planets, which are Earth, Mars, Mercury and Venus.
Some common characteristics shared by Jovian planets are that they are the farthest planets from the sun, have small cores and atmospheres composed of layers of different gases, including hydrogen, helium, methane and ammonia. These planets also have many moons and rings.
Jupiter has the most moons with 50 confirmed moons and others that are unconfirmed. Ganymede is Jupiter's biggest moon. Saturn has 53 and nine unconfirmed moons. Uranus has 27 moons, and Neptune has 13.