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Gravity, Gizmos, and a Grand Theory of Interstellar Travel | WIREDhttps://www.wired.com/story/mach-effect-thrusters-interstellar-travel/

Alpha Centauri EmDrive Ernst Mach Gravity Mach-effect gravitational assist (MEGA) drive Scientific methodology Space travel, exploration and defense

RF resonant cavity thruster - Wikipediahttps://en.wikipedia.org/wiki/RF_resonant_cavity_thruster

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Speculative physics