Jupiter is the biggest and heaviest planet in the solar system. It is so heavy that it weighs 318 as much as the Earth. Jupiter is the name for the most powerful Roman god. Jupiter has a deep atmosphere of hydrogen and helium. Deeper into the Jupiter the gas changes into liquid and in the middle of Jupiter there is a core of stone. The core of the stone is almost as big as Earth but much heavier.
Jupiter has 38 moons and every each of them has names. Most of the moons is small but the four biggest moons are as big as the smallest planets. The moons were discovered by Galileo. You can actually see them with regular binoculars.
The first who got to Jupiter was Voyager 1 and 2 in year 1977. But there are more who has visit Jupiter. It takes two years to get there.
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