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Pohl creates an exciting universe. Space explorers find an abandon station that has ships on it. The ships cannot be figured out, but they can be launched. Each goes to a predetermined destination which is unknown to the travelers. It goes and comes back. Along the way they learn more and more ... An alien race is hiding from a predator race that is exterminating life in the universe. Genocide on a grand scale. They have master concpts of physics and are hiding in a black hole. Learn about black holes and other phenomena in this great exploration adventure story. This is the first book in what became a series. Of course it gets tired around the third novel.