Surely in the the SW fandom there is a pseudo-scientific explaination plausible enough for the lightsaber. Anyway the Star Wars universe is not meant to be "heavily scientifically oriented", while a serious Star Trek fan could tell you the exact power in HP of all the Enterprise engines down to the second decimal digit.

(I know because when I was younger I was a trekker myself... now unfortunately I have no more time to spend in conventions...)

Giorgio

giorgio_2004 here, ksabers on XBox Live, PSN  and everywhere else.