I am curious about a short (maybe 16 pages) picture book that one of my friends had, around the time Return of the Jedi was released. It was a Star Wars story starring Luke Skywalker, but it clearly existed in a completely different universe. The book told a story that was vaguely similar to the destruction of the Death Star in A New Hope, but without the evil empire (or any villains at all, in fact).
Luke, in this book, was a student at the space academy (on a Tatooine-like arid planet). He had an instructor who was clearly drawn to resemble Han Solo but who had a different name (although it might have sounded a little bit like "Han Solo"). There is an emergency where a out-of-control moon is going to crash into the planet, so Luke and other pilots fly out to blow it up.
There are lots of lists of Star Wars books online, but if this one was listed somewhere, I could not identify it. The issues are that many lists do not include picture books or works that are completely out of continuity.