Interpretations of 2001: A Space Odyssey machines". Kubrick was also confronted with the fact that, during the production of the film, the US and USSR had agreed not to put any nuclear weapons into outer space by signing the Outer Space Treaty. Alexander Walker in a book he wrote with Kubrick's assistance and authorisation, states that Kubrick eventually decided that as nuclear weapons the bombs had "no place at all in the film's thematic development", now being an "orbiting red herring" which would "merely have raised irrelevant questions to suggest this as a reality of the twenty-first century". In the Canadian TV documentary "2001 and Beyond",
2001: A Space Odyssey (novel) trying to tell us something?" Clarke himself directly addressed the spelling issue in chapter 19 of "The Lost Worlds of 2001", explaining that he simply (and unconsciously) used the spelling he was familiar with from "The Conquest of Space" (1949) by Willy Ley and Chesley Bonestell, presuming that the "J" form is the German rendering of the Greek. The film "2010" was released in 1984 resulting in movie tie-in editions of both the "2001" and "2010" novels. At the time Signet Books reported that over 2.8 million copies of "2001" were in print and that "2010" was one of 1983's