ANSWERS: 4
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The Force, of course. [Addendum:] According to this: http://starwars.wikia.com/wiki/Diatium_power_cell the lightsaber is powered by a (fictional) substance called DIATIUM power cells. Apparently this is described in some of the books but not the movies.
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The typical Star Wars power cell. http://swg.wikia.com/wiki/Image:Lightsaber-cutaway.jpg
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Knock knock who's there? jedi jedi who? jed I think this geek has never been laid!
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crystals from the planet llum
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