Overview of ion thruster operation. In an ion thruster, ions are accelerated by electrostatic forces. The electric fields used for acceleration are generated by electrodes positioned at the downstream end of the thruster.
On Monday, NASA announced that its advanced ion propulsion engine operated for hours, or five and a half years, giving it the record for the longest test duration of any type of space propulsion system.
This is NASA's new concept spaceship for warp drive interstellar travel
This is NASA's idea for a warp drive spaceship, capable of interstellar travel. It's not a fantasy sci-fi ship but a concept based on the equations of Dr. Harold White—lead at NASA's Eagleworks Advanced Propulsion Physics Laboratory—who also works in ion engines and plasma thrusters.