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Fleet of Worlds is a book in Larry Niven's Known Space series. The Fleet of Worlds series, consisting of this book and its four sequels, is named for its opening book.
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Worlds closer to the galatic core than Known Space are --or were-- home to intelligent speciers. Some learned of the core explosion in time to flee. Destroyer of Worlds opens in 2670, ten years after Juggler of Worlds closes; with refugee species fleeing in an armada of ramscoops in the direction of the Fleet of …
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Kyle Gustafson had been doing work he loved, with the space program, anemic though it was, until disaster struck and a shuttle was lost on takeoff. There had to be a fall guy, and Kyle was picked-but a few months later, the American space program instantly became a quaint relic when aliens in a gigantic starship …