Jupiter is the largest planet in our solar system, with a diameter over 11 times that of Earth. It is known for its distinct bands of clouds and its iconic Great Red Spot, a massive storm that has been raging for centuries. Jupiter is primarily composed of hydrogen and helium, giving it a similar composition to that of a star. It has over 79 moons, the largest of which is Ganymede, and a thin ring system. Jupiter's powerful magnetic field creates intense radiation belts that can be harmful to spacecraft passing by.