Ion thruster still raises strange questions.

An ion thruster, ion drive, or ion engine is a form of electric propulsion used for spacecraft propulsion.

An ion thruster, ion drive, or ion engine is a form of electric propulsion used for spacecraft propulsion. An ion thruster creates a cloud of positive ions from a neutral gas by ionizing it to extract some electrons from its atoms. The ions are then accelerated using electricity to create thrust. Ion thrusters are categorized as either electrostatic or electromagnetic.