The EmDrive is an experimental thruster technology that should not work (according to the normal laws of physics), but seems like it might. People have been experimenting with it for 20 years. See also Ion Thrusters.

NASA Proves Emdrive Works And Physics Is Broken | Answers With Joe (Part 2)
The EM Drive: Fact or Fantasy? | Space Time
EmDrive, Revolutionary Propulsion System, How it Works – Roger Shawyer explains it
EmDrive Test No.03 Success, I have thrust !!!
Propellantless propulsion: The Chinese EmDrive by CAST scientist Dr Chen Yue, China’s Space Agency

Is the effect of “thrust” really just an interaction with the Earth’s magnetic field?

The Results of The Best EM Drive Test Yet

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