Scientists will comb data sent back from Titan by the Huygens probe for the chemical signature of life in a bid to identify the moon's source of methane. Methane is constantly destroyed by UV light so there must be a source within Titan to replenish the atmosphere. Life is a possible - though some think unlikely - source of this hydrocarbon along with geological processes. The surface is too cold for biology, but microbes could survive in an ocean within Titan.
Moon extraterrestrial life Titan Saturn methane Huygens