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Science Fiction vs. Physics: The Lightsaber Question - Neatorama

When a cool science fiction weapon sticks around for half a century and gathers more and more fans and more fiction, there will be people who put way too much thought into it. The lightsabers from Star Wars were born out of a cool special effect, but now everyone wants one, or at least wants to understand them. What happens if you drop a lightsaber? Specifically, what happens if you drop one vertically, business end first, into the ground. Would it keep burning its way through the earth indef...