Heaven Chronicles

From the back cover of the Questar/Warner omnibus edition: "Heaven System has no habitable planets, but Heaven Belt asteroids once supported space colonies richer and more advanced than even Earth... Until the Civil War. Now Heaven Belt is a vast ruin, where the yet-living prey on the artifacts of the dead. Where pockets of humanity use failing machines and radiation-leaking ships to battle over fragments of lost science in the fading hope of surviving another generation, another year. Meanwhile, light-years away, Morningside Colony desperately gambles scarce resources, building a single ship to seek the Belt's help. Seven brave men and women are now flying toward Heaven... And have just crossed the border into Hell."