The Basic Mechanism of a Plasma Material

If you can shoot off momentum in one direction, then the rest of the engine goes the other way. So what you need to do is get some cold stuff, really almost anything, and heat it up until it becomes a plasma,. And confine it in all but one direction. That's the basic principle. If you can use this idea to move the whole sun, or you can build your own little minnie plasma that reflects most of its energy back into itself - except in one direction.