The Ringworld series is a series of science fiction novels written by American author Larry Niven. It is part of his Known Space series of stories. Its backdrop is the Ringworld, a giant artifact 3 million times the surface area of Earth circling a star. The series is composed of four standalone science fiction novels, the original award-winning book and its three sequels: 1970: Ringworld 1979: The Ringworld Engineers 1996: The Ringworld Throne 2004: Ringworld's Children The companion novels to the Ringworld series are set in the same "Known Space" universe and all written by Niven and Edward M. Lerner: 2007: Fleet of Worlds 2008: Juggler of Worlds 2009: Destroyer of Worlds 2010: Betrayer of Worlds 2012: Fate of Worlds Source: Wikipedia (en)