To the Voyager spacecraft, Enceladus seemed like a fresh, smooth snowball.It was Cassini that first noticed how remarkable this small Saturn moon is indeed whose fissures blow fountains into the sky as if it were the Iceland of space.Cassini has now been dumped into Saturn, but what it has observed is by no means understood. Where does the heat originate that powers the geysers of Enceladus? Where do the organic substances inside come from? Can there even be life inside? This book presents the outstanding observations of Cassini for the first time.