Electric (plasma) propulsion devices have been used for applications such as station-keeping and orbit transfer, in place of chemical rockets, because they provide a higher specific impulse ... the ...

The rocket, a reaction-propulsion device that carries all of its propellants internally, has been around for almost a millennium since its invention in China. But the twentieth-century saw a ...

Electric propulsion is a more efficient alternative to traditional chemical rockets ... up momentum, however, because, despite moving at high velocity, the ion plume is pretty sparse. The impulse ...