A sub-light speed reactionless drive that manipulates the gravitational pull of nearby objects for thrust.[1] Widely used by the Kzinti before the advent of thrusters; still found in older Known Space spacecraft.
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A sub-light speed reactionless drive that manipulates the gravitational pull of nearby objects for thrust.[1] Widely used by the Kzinti before the advent of thrusters; still found in older Known Space spacecraft.