Redemption Ark (Revelation Space, #2)

by Alastair Reynolds

the presence of the wolves explained one of the great cosmic mysteries, a paradox that had haunted human minds since the dawn of spaceflight. The galaxy teemed with stars, and around many of those stars were worlds. It was true that not all of those worlds were the right distance from their suns to kindle life, and not all had the right fractions of metals to allow complex carbon chemistry. Sometimes the stars were not stable enough for life to gain a toehold. But none of that mattered, since there were hundreds of billions of stars. Only a tiny fraction had to be habitable for there to be a shocking abundance of life in the galaxy. But there was no evidence that intelligent life had ever spread from star to star, despite the fact that it was relatively easy to do. Looking out into the night sky, human philosophers had concluded that intelligent life must be vanishingly rare; that perhaps the human species was the only sentient culture in the galaxy. They were wrong, but they did not discover this until the dawn of interstellar society. Then, expeditions started finding evidence of fallen cultures, ruined worlds, extinct species. There were an uncomfortably large number of them. It was not that intelligent life was rare, it seemed, but that intelligent life was very, very prone to becoming extinct. Almost as if something was deliberately wiping it out. The wolves were the missing element in the puzzle, the agency responsible for the extinctions. Implacable, infinitely pati...