Saturn Rukh
Five carefully selected people, each with the chance to earn $1 billion. The  catch? They have to descend into Saturn's upper atmosphere and establish a factory that  will produce meta, the fuel that powers interplanetary flight. With only enough meta to  get them to Saturn, failure will cost them their lives. And all too soon the crew  becomes marooned on the back of what they dub a Rukh, a 4-kilometer-long creature  that swims in Saturn's upper atmosphere and has two brains, male and female. This  engaging book by physicist Robert L. Forward evokes the sense of wonder of old-time  science fiction.--This text refers to an out of print or unavailable edition of this title.