If you’re concerned about the legitimacy of plasma physics, let alone nuclear fusion, you might just want to skip this comment.
If you have seen The Phantom Menace, and still recall having seen it, you may remember that the Gungan army fought off the droid army with what appeared to be some kind of children’s toy. These “energy balls” supposedly consist of a blue plasma contained within an organic shell. However, I’m not quite sure what sustains the plasma, or how the blue slime fits into the picture.
But wait! There’s more:
You may recall that the climactic lightsaber battle began in the hangar and quickly moved into a large room with catwalks and vertical tubes glowing with a purple light. These tubes contained plasma, which was being mined from below the city. What’s more, the planet Naboo is an exporter of plasma. In fact, plasma is its primary export. In fact, the export of plasma was an important factor that contributed to its dispute with the Trade Federation, setting into motion the events of The Phantom Menace, the Prequel Trilogy, and the Original Trilogy. Now you know.