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[[File:Jupiter_9475.jpg|frame]]
The biggest gas giant, massing over 300 times more than Earth. It's mostly hydrogen and helium, although various other compounds provide its colorful bands and storms, and scientists believe a rocky core sits at its center. Its most prominent surface feature is called [[Exactly What It Says
Jupiter's orbit isn't quite circular; at perihelion, it's less than 5 A.U.<ref>A.U. stands for Astronomical Unit, the average distance between the Earth and the sun</ref> from the sun, but at aphelion it's nearly 5.5 A.U. away from the sun. One complete orbit takes almost 12 years. Despite its great size, Jupiter spins very rapidly on its axis, going all the way around in under 10 hours; this high rate of rotation causes the planet to bulge visibly at its equator, as though it were trying to fling some of its material off into space.
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