Various facts about the planet Jupiter

Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant 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 the third brightest natural object in the Earth's night sky. It is named after the Roman god Jupiter.

Jupiter is primarily composed of hydrogen, but helium comprises one quarter of its mass and one tenth of its volume. It likely has a rocky core of heavier elements, but lacks a well-defined solid surface.