Ringworld series

The Ringworld series (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:

The core series was developed with two side series of prequels set in the same Ringworld universe, and written in collaboration: