[kach22i]

Originally Posted by john70t

Space travel using electricity:
New paper claims that the EM Drive doesn't defy Newton's 3rd law after all - ScienceAlert
"The EM drive operates by the same principle, for example, as a jet engine, where the high speed exhaust gases backwards (opposite reaction) push the airplane forwards," one of the researchers Arto Annila, told ScienceAlert over email.

"Light at microwave lengths is the fuel that's being fed into the cavity ... and the EM drive exhausts backwards paired photons," he says. "When two photons travel together, but having opposite phases, then the pair has no net electromagnetic field, and hence it will not reflect back from the metal walls, but goes through."

And those escaping photons are the equal and opposite reaction that's producing the EM drive's thrust."

One side of the container must be weaker than the other to allow the paired up protons to consistently escape in the desired direction. Else this thing would just hover in equilibrium and not be propulsion at all.