Task: Explanation
Input (English): Great Sky River is a 1987 novel written by author Gregory Benford as a part of his Galactic Center Saga series of books. Question: What American science fiction author and astrophysicist, wrote the 1987 novel, Great Sky River? Answer: Gregory Benford
Output (English): Great Sky River is a 1987 novel written by author Gregory Benford as a part of his Galactic Center Saga series of books.