But there is a problem with that, that there should be some kind of aether of virtual particles that would have small velocity compared to the thruster. Yet the

But there is a problem with that, that there should be some kind of aether of virtual particles that would have small velocity compared to the thruster. Yet there is little evidence so far for such a thing. http://en.wikipedia.org/wiki/Aether_theories http://en.wikipedia.org/wiki/Aether_theories