Jupiter, the father of SATURN, is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant composed of mostly hydrogen and helium. Jupiter is known for its Great Red Spot, a large storm that has been raging for centuries. SATURN, the sixth planet from the Sun, is also a gas giant composed of mostly hydrogen and helium. It is the second-largest planet in the Solar System and is known for its stunning rings.