"Known Space" is a science fiction universe created by author Larry Niven. It features a vast array of planets, species, and technologies, primarily focusing on humanity's expansion into space. The timeline spans from the near future to distant epochs, showcasing the evolution of human civilization and its interactions with alien races. Key elements of "Known Space" include the Ringworld, a massive artificial structure, and the Kzin, a warrior race that often conflicts with humans. The universe explores themes of exploration, survival, and the consequences of advanced technology, making it a rich setting for various stories and characters.