The largest planet in the solar system and 318x the size of earth. For me that conjures up mental images of a really big dog chasing lots of little dogs (stars/other planets) around the sky...um, yeah, anyway...
It takes about twelve years for Jupiter to orbit the sun but it spins on it's axis fast and a day there only lasts for 9.8hrs. It has a diameter of 142,984km (88,846 miles) and contains 71% of all the planetary matter in the solar system.
As well as having approximately 63 moons Jupiter is the 5th planet from the sun and the magnetic field extends for 1,600,000km (994,194 miles).
Finally, Jupiter has a tiny inner rock core but otherwise is entirely composed of gasses. It's main composition is of Hydrogen and Helium. The temperature fluctuates from -163oC to 121oC and it has rings which are thought to be made up of dust particles.
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