The Universe

S04E09 Liquid Universe

On far-off planets, they fall from the heavens like molten iron. On remote moons, they float in crystal-clear lakes of methane, even in temperatures that plunge hundreds of degrees below zero. They can envelop entire worlds in vast, electrified oceans of hydrogen metal or burst forth from towering geysers. They swirl within the cores of extinct stars and even beneath our own feet. These extraordinary liquids are so scarce in the universe that they seem almost nonexistent, yet they are the enchanting substances that make up our Liquid Universe.