Ion Propulsion (for Space Travel)
https://solarsystem.nasa.gov/missions/dawn/technology/ion-propulsion/
Ion propulsion was proved on NASA's Deep Space 1 mission, which tested it and11 other technologies while journeying to an asteroid and a comet.
Each of Dawn's three 30-centimeter-diameter (12- inch) ion thrust units is movable in two axes to allow for migration of the spacecraft's center of mass during the mission. This also allows the attitude control system to use the ion thrusters to help control spacecraft attitude.
https://www.dailymail.co.uk/sciencetech/article-6119917/The-engine-man-Mars-NASA-reveals-latest-tests-radical-ion-propulsion-system.html
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