Farthest star : the saga of cuckoo
Frederik Pohl (Author), Jack Williamson (Author), David B. Mattingly (Illustrator)
Cuckoo was coming. No one knew what it was -- but everyone knew it was trouble. Designated Object Lambda when it first appeared on the fringes of the galaxy, 20,000 light-years away, it was travelling at one-sixth the speed of light. The astrophysicist said that it was vast... light... and had the potential for utter destruction. So an existing space probe was reoriented to intercept; it was staffed with replicates of both humans and aliens. Then the space probe began to leak radiation..
Print Book, English, 1983
Ballantine Books, New York, 1983