Fleet of Worlds are both a location and a book in Larry Niven's Known Space series.  The series consisting of this book and its sequels is referred to by the same title.
The novel, co-written by Niven and Edward M. Lerner, was released in 2007. It is set shortly after the events of the short story "At the Core", and was followed by four sequels by the same authors -- Juggler of Worlds in 2008, Destroyer of Worlds in 2009, Betrayer of Worlds in 2010 and Fate of Worlds in 2012. The story concerns the independence of New Terra from the Concordance. It also is the exposition of the Gwo'th.    
The Fleet of Worlds are the home planets of the Pierson's Puppeteer race. They consist of the native homeworld, called "Hearth", and its agricultural worlds, arranged in a Klemperer rosette. The number of worlds has varied; at maximum (at the opening of the novel Fleet of Worlds) the Fleet comprised six worlds. By two Earth centuries later, in Niven's novel Ringworld, the Fleet contains five worlds.
The Puppeteers first moved their worlds into this formation when their home star turned into a red giant, using an inertialess, reactionless drive purchased at great price from the Outsiders. After the discovery that the core of the galaxy is exploding, the Puppeteers turned the fleet towards the Magellanic Clouds, gradually reaching a speed of 80% lightspeed. Although the Puppeteers have Faster-than-light technology they prefer to travel at safer, sub-light speeds.
- ^ Niven, Larry; Lerner, Edward (2007), Fleet of Worlds, New York: Tor Books, ISBN 978-0-7653-1825-1
- ^ Niven, Larry; Lerner, Edward (2008), Juggler of Worlds, New York: Tor Books, ISBN 978-0-7653-1826-8
- ^ Niven, Larry; Lerner, Edward (2009), Destroyer of Worlds, New York: Tor Books, ISBN 0-7653-2205-6
- ^ Niven, Larry; Lerner, Edward (2010), Betrayer of Worlds, New York: Tor Books, ISBN 0-7653-2608-6
- ^ Niven, Larry; Lerner, Edward (2012), Fate of Worlds: Return from the Ringworld, New York: Tor Books, ISBN 0-7653-3100-4
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