Jupiter is the most massive of all planets in the solar system. In fact, it is twice as big as all of the other planets combines, and 318 times bigger than the Earth. On a clear night, you can easily spot Jupiter, as it is the fourth brightest light in the sky. It is composed mostly of gases, particularly liquid metallic hydrogen. The bright colors that radiate from the planet are the result of various chemical reactions that are taking place amongst the gases. One of Jupiter's claims to fame is the Great Red Spot, which looks like, well, a Great Red Spot. It is actually a a region of very high pressure that is colder than the rest of the planet. The planet also features rings that are darker and much smaller than Saturn's rings. They are made up of rocky particles. Jupiter has high velocity winds, and has a very strong magnetic field. Jupiter probably has a core of rocky material amounting to something like 10 to 15 Earth-masses. For our purposes we'll assume it does, so we can pretend to play ball on it.
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