Did you know that the deep interior of Jupiter is made of an exotic substance called liquid metallic hydrogen?
Jupiter (click to enlarge)

Hydrogen in the Universe is most commonly found in the gas phase. Like other elements, however, Hydrogen has liquid and solid phases at low enough temperatures and high enough pressures. Despite the extreme pressures inside the Sun, million-degree temperatures keep Hydrogen in the gas form. Inside Jupiter, however, pressures are high and temperatures only a moderate few tens of thousands of degrees. Under these conditions, liquid metallic hydrogen forms. Extreme pressure frees electrons from the individual Hydrogen nuclei, allowing them to flow freely as in a metal. Currents in Jupiter's liquid metallic Hydrogen layer generate the planet's enormous magnetic field.

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