(1971 Hugo for Best Novel, 1970 Nebula for Best Novel)

In the first book of this award-winning series, a huge architectural ring is constructed in outer space. In time it will house the inhabitants of the dying Earth. A whole new world is emerging, a world of huge dimensions, encompassing an area three million times the area of the Earth. Ringworld has a gravitational field and high walls to preserve its atmosphere. Its proximity to the sun maintains the new planet's climate. With those kinds of resources at its disposal, humankind can begin anew -- but not without meeting the disquieting challenges of a brave new world. Breath- taking ingenious from start to finish, RINGWORLD is fast becoming a science fiction classic.