If it works, it would mean that you could go into space without reaction mass. It would open up the possibility of relativistic travel. You could build a rocket

If it works, it would mean that you could go into space without reaction mass. It would open up the possibility of relativistic travel. You could build a rocket the mass of a VW camper and push it into space by remotely powering it with lasers, as all the EMDrive apparently needs is electrical energy.