propulsion based on quantum gravity and localized space-time manipulation rather than conventional thrust. Instead of pushing against air or ejecting mass, the craft would alter the geometry of space-time around it (through the possible particle physics of quantum gravity), allowing apparent motion without traditional momentum exchange. If something like this were possible, it could also explain extreme acceleration, lack of sonic booms, ect. I'm sure this idea has been very well thought out, I'm just looking for anything anyone can add to it. submitted by /u/Icy_Key457 [link] [comments]