Jupiter is often called the King of Planets, and is the largest in our solar system. It is the fifth planet from the sun, and composed primarily of hydrogen and helium. It has no solid surface, and is unique in that it gives off more energy than it recieves from the sun.
1,000 km beneath Jupiter's cloud tops, the enormous pressure turns the hydrogen gas into liquid hydrogen. Jupiter spins so fast (it's day is the shortest of all the planets, at only 10 hours) that it's liquid mass bulges outward at the equator.
The temperature at Jupiter's cloud tops is -148 degrees celsius. It is known for its storms. Jupiter's Great Red Spot is the center of a storm system that was first seen more than 300 years ago.
Jupiter's year is 11 Earth years and 314.96 Earth days long. It has at least six moons, then four largest being Europa, Io, Callisto, and Ganymede. Only Europa is smaller than our moon.
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