Scientists studying the infrared pictures decided that one or more of the large lakes in the pictures of Saturn 's moon Titan does hold liquid and that the liquid is made of hydrocarbons . They have also found ethane on Titan . Based on this instrument 's observations , scientists concluded that at least one of the large lakes observed on Saturn 's moon Titan does in fact contain liquid , that liquid being hydrocarbons , and have positively identified the presence of ethane .