Jupiter

Jupiter is the fifth planet away from the sun and the largest planet in our solar system. Jupiter is one of the gas giants, as are Saturn, Uranus, and Neptune. This group of planets is also referred to as Jovian (outer planets) group. Jupiter is mostly made of hydrogen and helium, but its core may have some heavier elements inside it. Jupiter's most noticeable feature is the Giant Red Spot, a storm that has been going on for at least 200 years. Jupiter also has at least sixty six moons, the largest being Ganymede, whose diameter is greater than that of Mercury. Jupiter has been visited by both the Pioneer and the Voyager.