An honored SF writer returns to his best-known creation: the artificial world, built far from Earth by aliens over a half million years ago, in the form of a ring 600 million miles in diameter, hosting an astonishing multitude of inhabitants and...
Ringworld, the most celebrated work in Niven’s “Known Space” sequence, posited a vast body of matter — enough for an entire solar system — spinning around a sun in the form of a single giant artifact of unknown origin: a continuous...