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Jupiter is the largest of the planets. It is eleven times greater than the Earth, having a more than 300 times greater mass - it is 2.5 times heavier than all the other planets together. Jupiter is visible with naked sky, one of the brightest objects in the nightly sky.
Jupiter has only a relatively small stable core. Around this is a area of metallic hydrogen, which again is surrounded by a layer of liquid hydrogen. This is surrounded by gaseous hydrogen. But these areas have no exact boundary, the elements transits to each others.
Jupiter has an atmosphere of 90% hydrogen and 10% helium.
Jupiter is the name of a Roman God.
Jupiter has a planetary ring system consisting of dust particles, which are throwed out from Jupiters moons when meteors hitted the surface. The outer ring assumedly consists of captured interplanetary dust.
Jupiter is surrounded by a lot of moons. Before the fly bys of the Voyager satellite expeditions 16 moons are known, but the missions found many more moons. There are 8 regular Moons around Jupiter on inner circular orbits, and a greater number of irregular objects on irregular shaped orbits, supposable catched asteroids.
63 Moons are known now. Ganymede, Io and Europa show volcanism and internal heating, this makes them comparable with planets.