Hex

Two-time Hugo Award winner Allen Steele expands the universe of his Coyote saga with the story of Hex, a habitat the size of an entire solar system that could be a utopia--or nothing but a cosmic mirage...
The danui, a reclusive arachnid species, have avoided contact with the Coyote Federation--until now. Initiating trade negotiations, they offer only the coordinates for an unoccupied world suitable for human life--a massive sphere composed of billions of hexagons.
But when the Federation's recon mission goes terribly wrong, the humans realize how little they know about their new partners...