Class I or Jovian gas giants have primarily hydrogen and helium atmospheres. Coloration comes from clouds in the upper atmosphere of ammonia, water vapour, hydrogen sulphide, phosphine and sulphur. The temperature at the top of their upper cloud layers is typically less than 150 K.
— In-Game Description
Jupiter is the 5th and the largest planet in the Sol System. Jupiter is massive by planetary standards and is orbited by a network of nearly 70 natural satellites, one of which is larger than Mercury. Jupiter has a thin ring system and many storms rage on the planet's surface.