Saturn Rukh is a hard science fiction novel written by the United States physicist Robert L. Forward. It was first published in hardcover in March 1997 (and later in paperback in 1998) by Tor Books. Saturn Rukh is themed around human contact with alien organisms on the gaseous planet Saturn. Like many of Forward's books, the novel is a speculation of the nature of intelligent life in a non-Terran ecosystem, in this case the atmosphere of a gas giant. Source: Wikipedia (en)