We tend to think of Mars when looking for alien life in the solar system, but surprisingly our best bet to find extraterrestrial organisms may very well be the icy moon Enceladus. The interior of the moon is heated as Enceladus flexes under the influence of Saturn’s gravity, and the ice we see may just be a thick shell over a vast undersurface ocean. To the shock of astronomers, towering geysers were seen in Cassini pictures erupting from the moon’s south pole (see below). They’re mostly water but also contain dust and organic compounds. Those molecules, together with the heat provided by Saturn’s gravity flexing the tiny moon, make Enceladus a very intriguing target for the study of exobiology: life beyond Earth.