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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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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