Star Wars is perhaps the most iconic mythology of the last century. Even if someone has never watched one of the movies, they know what a stormtrooper looks like. They can recognize a lightsaber. And moon-sized superweapons and the Force pervade every-day references. And yet, despite the impact of this great science-fiction epic, Star Wars has made a lot of mistakes in the “science” part of “science fiction”.
In fact, many of the trappings that we know and love are more for visual effect rather than practicality. And this is not limited to the generic details of the world, but the entire way that we perceive the culture of Star Wars functioning.
Some parts are far more obvious than others. Any Star Wars fan is used to great armies traversing the galaxy on a whim, fighting battles on planets halfway across the galaxy from each other in the same week, or even the same day. And yet, real space travel is prohibitively expensive. Like any technology, the price will eventually become more affordable the more advanced a society becomes, but that barrier will never be totally removed.