The length of a chapter in a science fiction novel varies depending on the author and the work, but it is usually no less than 2000 words and may even be as long as 3000 words or more. The length of a chapter should be enough to develop the plot and the development of the main characters, but also enough space to introduce new plots and elements. When writing science fiction, the length of a chapter can be flexibly controlled, and it needs to be adjusted according to the story and writing style.