Ursula Le Guin, Isaac Asimov and Cixin Liu (Composite image by James T. Keane) Do you cringe when you’re watching “Star Wars” and Han Solo says the Millennium Falcon did the Kessel Run in less than 12 parsecs, because a parsec is a unit of distance, not time? Are you offended that Chekov and Khan recognize each other in “Star Trek II: The Wrath of Khan,” because by Star Trek canon they’ve never met? Do you think “John Carter” is the worst movie ever for the way it bastardized the vision of Edgar Rice Burroughs? You just may be a...