Giant Jupiter is 2.5 times the mass of all the other planets combined. At its center is a rocky core about twice the size of Earth. The rest of the planet consists of mainly of hydrogen in various states. Solid hydrogen forms an inter mantle, surrounded by a liquid hydrogen and helium outer mantle. No solid crust is present. Instead, the surface features visible from Earth are shapes in the atmosphere, like the Great Red Spot. Hydrogen is the main constituent of the atmosphere (90%), followed by helium (almost 10%).
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