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The Jovian Planets do not have an "surface" as we know it. Since they are composed primarily of hydrogen, ammonia, and methance, these gases gradually compress/condense to a suspended soupy mixture thousands of kilometres below the cloud tops. As one goes deeper, this "soupy" mixture gradually becomes a vast ocean of liquid hydrogen made possible under massive pressure. One can still go deeper and the liquid hydrogen starts to behave like a metal under the fantastic pressure of 10's of thousands of kilometres of atmosphere. That's why Jupiter, especially, as a strong magnetic field. This vast ball of rapidly spinning liquid metallic hydrogen acts like a giant dynamo! It is presumed that each the Jovian Planets each have a rocky core roughly the size of earth.

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13y ago

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