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Jupiter is the fifth planet from the Sun, named after the Roman god Jupiter, and the largest planet in the Solar System. It is a gas giant, with a mass one-thousandth of that of the Sun but is two and a half times the mass of all the other planets in the Solar System combined.

Jupiter is primarily composed of hydrogen with a quarter of its mass being helium, although helium only comprises about a tenth of the number of molecules. It might have a rocky core of heavier elements, but like any other Gas giant, Jupiter lacks a solid surface.

Jupiter is composed primarily of gaseous and liquid matter. It is the largest planet in the Solar System as well as the biggest of all four Gas Giants.