George Lucas found a box containing historical records of the Star Wars galaxy in in front of his house and decided to make a film adaption. All movies, video games, audio dramas, novels, comics, role-playing sources etc. are just adaptions. Luke Skywalker and Han Solo looked as much like Mark Hamill and Harrison Ford as every other real person looks like the actor portraying him or her in a movie. Lord of the Rings too is about real history. It happened over 6000 years ago. The books are just a record of those ancient times and contain some errors, while the movies are just adaptions. In real life, Aragorn, Eowyn and Gandalf looked similar to, but not exactly like Viggo Mortensen, Miranda Otto and Ian McKellen.