А вот и прототип найвеновского Мира-Кольца нашелся

[eska]

At a briefing this month on the planet found orbiting a red-dwarf star, reporters pressed NASA astronomy and physics chief Anne Kinney for a celestial counterpart in science fiction.
Her answer: Ringworld, the 1970 novel by Larry Niven that won the 1971 Hugo Award for science-fiction achievement and spawned four sequels. The most recent, Ringworld's Children, was published in June.
http://www.usatoday.com/news/science/2004-09-15-nasa-ringworld_x.htm