Jupiter spins the fastest, but it's the largest!
Imagine this: a planet that is eleven times as big as the Earth, but one day lasts less than half of the day on Earth!
Remember that Jupiter is a gas giant - it means that it is mainly composed of Hydrogen and Helium (like the Sun!), but it's about -110°C cold.
Although it doesn't show in pictures, Jupiter has rings, as well as many, many, many moons. The biggest moon in the Solar System is Jupiter's Ganymede.
Do you know how many moons circle around Jupiter?
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