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Space startup Exodus Propulsion Technologies claims to have achieved a breakthrough, stumbling upon an entirely new force of nature that could power thrusters that don't need propellant to work.
To Buhler, it's a major breakthrough that means "that there’s some underlying physics that can essentially place force on an object" given "an asymmetry in either electrostatic pressure or some kind of electrostatic divergent field."
Of course, Buhler's comments should be taken with a grain of salt, given the subject matter and the device's strained relationship with the established laws of physics.