Will a reactionless drive be conclusively demonstrated operational in space before 2100? | Manifold

Will a reactionless drive be conclusively demonstrated operational in space before 2100?

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@DavidUlliac Care to say what current research direction or concept you think is most promising?

Would this include drives that react against the Earth's magnetic field, or photonic thrusters? Or just things with better -than-photonic impulse, e.g the hypothetical EM drive?

predicts YES

@waterlubber Using the Earth or photons as reaction mass is not "reactionless".

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