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Jupiter is the largestplanet in theSolar System. It is the fifth planet from theSun. Jupiter is classified as agas giant. This is because it is very big and made up ofgas. The other gas giants areSaturn,Uranus andNeptune. Jupiter has amass of 1.8986×10²⁷ kg or about 318 Earths. This is twice the mass of all the other planets in the Solar System put together.

Jupiter was known to theancient Romans. They named it for the Roman godJupiter. Jupiter is the third brightest object in the night sky. Onlythe Earth's moon andVenus are brighter. Jupiter has at least95 moons. 75 of these moons are very small at less than 5km wide. The four mainmoons areIo,Europa,Ganymede andCallisto. These moons are the largest. These four are called theGalilean moons. They are called this because they were discovered by theItalian astronomerGalileo Galilei.Ganymede is the largest moon in the Solar System.