ability to use them, they usually don't need them anymore. This is even more the case with the last two; once one of these megastructures is complete, the race controlling the ringworld or sphereworld has almost unlimited resources, usually leading to defeat of the others. In The Saga of the Seven Suns, by Kevin J. Anderson, humans are able to convert gas giant planets into stars through the use of a "Klikiss Torch". This device creates a wormhole between two points in space, allowing a neutron star to be dropped into the planet and ignite stellar nuclear fusion. See also References Exploratory engineering Fictional technology Engineering