Ringworld

The ' (1970–2004), by science fiction author Larry Niven, is a part of his Known Space set of stories. Its backdrop is the Ringworld, a giant artifact 600 million miles in circumference around a sun. The series is composed of four standalone science fiction novels, the original award-winning book and its three subsequent sequels:
1970: Ringworld
1980: The Ringworld Engineers
1996: The Ringworld Throne
2004: Ringworld's Children
The core series was developed with three side series of prequels set in the same Ringworld universe, and written in collaboration:
1988–2009: Man-Kzin Wars (by various edited by Niven)
2007–2010: Fleet of Worlds (by Niven and Edward M. Lerner)
2010-2011: Juggler of Worlds (by Niven and Edward M. Lerner)

ISBN: 0575077026