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[[File:RS-68_rocket_engine_test.jpg|RS-68 rocket engine test|thumb]] [[File:Viking_5C_rocketengine.jpg|Viking 5C rocketengine|thumb|left]] [[File:Liquid-Fuel_Rocket_Diagram.svg|Liquid-Fuel Rocket Diagram|thumb|left]] [[File:Solid-Fuel_Rocket_Diagram.svg|Solid-Fuel Rocket Diagram|thumb]] [[File:Rocket_thrust.svg|Rocket thrust|thumb]] [[File:Rocket_nozzle_expansion.svg|Rocket nozzle expansion|thumb]] '''Rocket engine''' is a type of [[jet engine]] that produces thrust by expelling [[rocket propellant]] at high speed through a [[nozzle]]. Unlike airbreathing engines, rocket engines carry both fuel and an [[oxidizer]], allowing them to operate in the vacuum of space where there is no oxygen to support combustion. This makes rocket engines essential for all [[spacecraft]] propulsion.

==Principle of Operation==
The operation of a rocket engine follows [[Newton's third law]]: for every action, there is an equal and opposite reaction. The engine burns propellant in a combustion chamber and expels the hot gases out of a nozzle, which propels the rocket in the opposite direction. The efficiency of a rocket engine is often measured by its [[specific impulse]], a measure of thrust per unit of propellant consumed over time.

==Types of Rocket Engines==
Rocket engines can be classified based on different criteria, such as the type of propellant used, the method of propellant combustion, or the reuse capability of the engine.

===Liquid Rocket Engines===
[[Liquid rocket engines]] use liquid propellants that are fed from tanks into a combustion chamber. These engines can be further divided into [[bipropellant rocket engines]], which use two separate propellants (a fuel and an oxidizer), and [[monopropellant rocket engines]], which use a single propellant that decomposes in the presence of a catalyst. The [[Space Shuttle]]'s main engines and the engines used on the [[Saturn V]] rocket are examples of liquid rocket engines.

===Solid Rocket Engines===
[[Solid rocket engines]] use a solid propellant that is pre-mixed and cast into shape before being loaded into the engine. Once ignited, a solid rocket engine burns until all the propellant is exhausted. These engines are simpler and often more reliable than liquid rocket engines but lack the ability to be throttled or shut down once ignited. Solid rocket boosters were used on the Space Shuttle to provide additional thrust at liftoff.

===Hybrid Rocket Engines===
[[Hybrid rocket engines]] combine aspects of both liquid and solid rocket engines. They typically use a solid propellant and a liquid or gaseous oxidizer. The oxidizer is fed into the combustion chamber where it reacts with the solid propellant. Hybrid engines can be throttled and shut down, offering more flexibility than solid rocket engines.

==Applications==
Rocket engines are used in a variety of applications, from launching [[satellites]] into orbit to propelling [[interplanetary spacecraft]]. They are also used in military applications, such as [[missiles]], and for scientific research in [[high-altitude sounding rockets]].

==Challenges and Developments==
The development of rocket engines faces several challenges, including improving efficiency, reducing costs, and ensuring reliability and safety. Recent advancements include the development of [[reusable rocket]] technology, exemplified by companies like [[SpaceX]] with their Falcon 9 rocket, which aims to reduce the cost of access to space by landing the first stage of the rocket for reuse.

==Environmental Impact==
Rocket engines, particularly those that use certain types of propellants, can have an environmental impact, including the emission of greenhouse gases and other pollutants. Research is ongoing into more environmentally friendly propellants and propulsion methods, such as electric propulsion systems, which offer the potential for cleaner space travel.

[[Category:Rocket engines]]
[[Category:Spacecraft propulsion]]
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