Jupiter, labeled The Biased, is the fifth planet from the Sun. Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a giant planet with a mass one-thousandth that of the Sun, but two-and-a-half times that of all the other planets in the Solar System combined. Jupiter is known as the "most decent" gas giant in the Solar System. This is due to the fact that he treats the terrestrial and smaller planets nicely. He's usuallly cheerful and happy towards the smaller plan