How much time do they spend at any point in Star Wars trying to explain how anything works? They don't; you just accept that it does.
The films don't, except for the whole 'the force is made of little dudes living inside you' thing, but the EU seems to have picked up the slack. There's great walls of text out there about lasers really being particle beams and ion engines with 3000 G's worth of acceleration for anyone who cares. Back on topic I do agree Star Trek's attention to detail and internal consistency very cool.