Story started with the abduction of a number of inhabitants of a planet by technologically superior aliens. I think the abductors and abductees were all human. They are transported by spaceships to an artificial mega-structure, a galaxy sized ellipsoidal object with an aperture at one end. The inner wall of the mega-structure is inhabited and apart from the aperture are isolated from the rest of the universe. The abductees are destined fight in some war or conflict in this enclosed habitat.

There are many stars floating in the vastness of the structure's interior which is light years in extent. The stars have been engineered and placed to provide energy for the galactic sized inner living surface. The vastness of the structure is described in detail. It blew my mind when I read this and I still regard it as one of the most original books I ever read.

  • Welcome to SFF.SE! Any details you can add, like when the book may have been published, language, or cover art work can help our story-id experts help you. Good Luck! – Skooba Jan 5 '17 at 20:50
  • Sounds like Bob Shaw's Orbitsville series. – user14111 Jan 5 '17 at 20:52
  • Good suggestion. But that's not it. Megastructure in question is far bigger than Orbitsville's structure. I seem to remember that the original builders were somewhat horrified by the primitiveness of living, unprotected, in the universe "at large". They, however, needed soldiers to fight in their unending conflicts. – Karl Attrill Jan 5 '17 at 21:14
  • Assuming a galaxy sized megastructure wouldn't take all the matter in the universe to construct, it seems like an awful waste of space. If you put everyone who has ever lived on earth and scattered them around the inside, none of them would ever meet, or be able to communicate. – Seeds Jan 5 '17 at 21:21
  • 2
    Could that be Alistair Reynolds' "Pushing Ice"? Some of the details don't quite fit but a lot do. – Moriarty Jan 6 '17 at 1:52

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