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A concept from NASA's Breakthrough Propulsion Physics Program, the diametric drive functions by creating an asymmetric field around itself. Under such a field, the side of the field which creates more force on the spacecraft will accelerate the spacecraft in the direction of the force. It is unknown whether it is even physically possible to create such a field. One possibility is through the use of particles of negative mass. Stability issues arise in some such designs, however the huge constant acceleration without need for fuel or reaction mass is certainly an attractive idea.
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