Hydrogen is the smallest molecule in the Universe, which makes keeping it in one place difficult. To tap its tremendous potential as a fuel, spacecraft must be able to store liquid hydrogen at extremely low temperatures and then feed it smoothly to rocket engines.  

When ESA was developing its hydrogen-fueled Ariane rockets, they got Austria’s MagnaSteyr to build tightly sealed fuel lines and double-walled storage tanks capable of trapping and holding liquid hydrogen and oxygen. Now MagnaSteyr has adapted the technology developed for Ariane to build clean-burning cars that can use hydrogen instead of gasoline for fuel. 
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