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Reactionless drive
A reactionless drive or inertial propulsion engine (also reactionless thruster, reactionless engine, and inertia drive) is any form of propulsion not based around expulsion of fuel or reaction mass - the name comes from Newton's Third Law of Motion, usually expressed as, "For every action, there is an equal and opposite reaction." Such a drive would use a hypothetical form of thrust that does not require any outside force or net momentum exchange to produce linear motion.
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