Ringworld

A hastily-assembled team of explorers travels to the farthest reaches of space to investigate a mind-blowing alien artifact called Ringworld - an artificial habitat the size of one million Earths. As they crash land on this enormous structure, they discover the remnants of ancient civilizations, technology beyond their wildest dreams, mysteries that shed light on the very origins of man and, most importantly, a possible salvation for a doomed Earth.

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