Three months after the motion picture was released, Clarke’s novel by the same name saw its first printing. Instead of a movie based on a book, the book was based on the movie screenplay. However, there were major differences between it and the movie, the greatest of which was probably Discovery 1’s planetary target. In the movie it traveled to Jupiter, but in the novel it journeyed all the way to Saturn. At Saturn, the final rectangular monolith was on the surface of Saturn’s third largest moon, Iapetus, rather than floating lazily in space as in the movie.