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It is a gas giant. It is mostly gas but is believed to have rock and ice core about 9500 miles in diameter. So there is a surface under a dense atmosphere over 10,000 miles thick of mostly hydrogen and helium with a small amount of methane. The temperature at the surface is -200 degrees Celsius. The planet has the highest winds of any planet in the solar system, reaching up to 1,200 mph. The surface pressure is 980 times that of Earth's.

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15y ago

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