Titan

Titan is a science fiction novel by American writer John Varley, the first book in his Gaea Trilogy, published in 1979. It won the 1980 Locus Award for Best Science Fiction Novel and was nominated for both the Nebula Award for Best Novel in 1979, and the Hugo Award for Best Novel in 1980. It imagines a visit to Saturn's satellites by a scientific team from Earth who are soon enwrapped in a mystery after they discover extraterrestrial life.