This a is well written, gripping story. Three hundred years in the future, humanity has colonised over 400 hundred planets. This was possible due to the invention of wormhole technologies which allow people to travel through space without spaceships. Wormholes also allow faster, almost instant communication between planet's light years away. Humanity is enjoying immortality with rejuvenation treatments which reverse the ageing process, and re-life procedures ( resucitation!) in which digital copies of people consciousness and memories are uploaded into new bodies made with DNA information.
Anyway this is only a snippet of this universe created by Hamilton. The action kicks with the discovery of what seem to be Dyson Spheres enclosing two solar systems. A decision is made to travel more than one thousand light years to investigate them. Political, economic and scientific struggle arise from this decision, but the focus of the story is set on answering a couple of questions. What kind of civilisation could have the technology to build a dyson sphere? And why would they do that?

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