Cryogenic Engine

A cryogenic engine (or cryogenic rocket engine) is a type of liquid-propellant rocket engine that uses liquefied gases stored at extremely low (cryogenic) temperatures as fuel and oxidizer. Cryogenic = temperatures below -150°C, where gases like hydrogen and oxygen exist as liquids. Used in upper stages of rockets like: ISRO’s GSLV Mk-II/Mk-III NASA’s Space Launch System Ariane 5 (ESA) SpaceX Falcon 9 upper stage A cryogenic engine burns supercooled liquid hydrogen and oxygen, delivering high thrust and efficiency — essential for launching satellites and deep space missions.