Jupiter is the biggest planet in our solar system. In fact, it is bigger than all the other planets put together. Its diameter is about 143,000 kilometers.
The planet is named after the king of the Roman gods. Jupiter is a giant ball of gases, mostly hydrogen and helium. The center of the planet is probably made of a hot liquid. Jupiter is extremely hot, thousands of times hotter than the hottest place on Earth. Its center may reach temperatures of 25,000° C. It does not have a solid surface at all.
The planet has more than 60 moons. Most of them are very small.