Jupiter
Jupiter is, after the Sun, the largest celestial body in the solar system with a mass almost two and half times that of the other planets combined (with a mass 318 times the mass of the Earth and 3 times the mass of Saturn) This planet is mainly formed by hydrogen and helium. It hasn't got a defined inner surface. Jupiter is the fourth brightest object in the sky (after the Sun, the Moon and Venus). Jupiter probably has a core of rocky material amounting to 10 to 15 Earth masses. The interior of Jupiter is hot: the core is probably about 20,000 K Jupiter is just about as large in diameter as a gas planet can be. Jupiter has a huge magnetic field, much stronger than Earth's. Jupiter has rings like Saturn's, but fainter and smaller.