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Spacecraft Propulsion
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Electric Propulsion
Relies on electric power to change the velocity of a spacecraft. Example: Hall-effect thrusters used on communication satellites.
Solar Sail
Uses the pressure from solar photons to produce thrust. Example: IKAROS, by JAXA.
Variable Specific Impulse Magnetoplasma Rocket (VASIMR)
Uses magnetic fields to heat and expel plasma, adjustable specific impulse. Example: Proposed for future Mars missions.
Air-Breathing Electric Thruster
Collects ambient air as propellant and uses electric energy for ionization and thrust. Example: Proposed for low Earth orbit satellites.
Pulse Detonation Engine
Relies on detonations of a fuel mixture to produce thrust. Example: Experimental, not yet used for active spacecraft propulsion.
Nuclear Electric Propulsion
Combines a nuclear reactor with electric propulsion such as ion thrusters. Example: Conceptual designs for future deep space exploration.
Electrothermal Thruster
Accelerates propellant by thermal energy, which can be electrically powered. Example: Arcjet thrusters on spacecraft.
Nuclear Thermal Propulsion
Heats a propellant using a nuclear reactor to create thrust. Example: Project NERVA (never flown).
Magnetoplasmadynamic Thruster (MPD)
Uses the Lorentz force to accelerate plasma for propulsion. Example: Used mainly in theoretical studies and experimental models.
Cold Gas Thruster
Employs a pressurized inert gas that is expelled to produce thrust. Example: Maneuvering thrusters on satellites.
Pulsed Plasma Thruster
Uses quick bursts of plasma to create thrust. Example: Ejection of Teflon plasma on CubeSats.
Hybrid Rocket Engine
Combines solid fuel with liquid or gas oxidizer for thrust. Example: SpaceShipTwo by Virgin Galactic.
Resistojet Rocket
Heats a non-reactive fluid to expel it for thrust. Example: Satellite propulsion for altitude adjustments.
Chemical Propulsion
Uses the reaction of chemical propellants to produce thrust. Example: Saturn V rocket.
Ion Thruster
Uses electric fields to accelerate ions to produce thrust. Example: NASA's Dawn spacecraft.
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