Today during a conference, NASA announced that life could exist on the small moon of Saturn known as Enceladus. Many scientists have suspected that there could be a subsurface ocean that covers the entire moon or just the southern pole. NASA scientists know believe that it is quite possible that Enceladus could be harbouring an ocean and it may contain life.
Enceladus has hydrothermal vents on its sea floor similar to the ones found here on Earth. The temperatures around these vents would be adequate temperatures to sustain life. NASA believes that life could exist around these vents.
Jupiter's moon Europa may also have a subsurface ocean but similar to Europa it is hard to determine because if there is one, it is covered by a 30km thick ice sheet.
The Cassini probe collected samples from Enceladus when it dived into one of it's icy plumes. It discovered that the plume contained methane, hydrogen and carbon dioxide among other elements. Methane is usually produced by small bugs as well as other creatures.
The hydrogen levels were large enough to suggest that their is a constant source of hydrogen and that it is not simply a coincidence that Cassini dove into the plume when it happened to have a chunk of hydrogen. Hydrogen and Carbon dioxide are key components needed during the process of Methanogenesis (the production of methane).
The team behind the discovery were eager to point out that the presence of Methanogenesis does not confirm for definite that life exists on Enceladus but it certainly increases the chances that life may just be present somewhere other than Earth.