Liquid rocket engines are propulsion systems that use liquid propellants to produce thrust. These engines typically consist of a combustion chamber where fuel and an oxidizer are mixed and ignited. The resulting high-pressure gases are expelled through a nozzle, generating thrust that propels the rocket forward. Common propellants include liquid oxygen and kerosene. One of the main advantages of liquid rocket engines is their ability to be throttled, allowing for precise control of thrust during flight. This feature is crucial for missions that require specific maneuvers, such as those undertaken by NASA or SpaceX. Liquid engines are widely used in various space missions and satellite launches.