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Tar­get: Ence­ladus and Ti­tan

Although ac­tiv­ity on Ence­ladus had been sus­pected since the 1980s, the Cassini or­biter con­firmed this in spec­tac­u­lar style when it flew straight through one of the moon’s tow­er­ing vapour plumes in 2005, shortly af­ter its ar­rival in or­bit around Saturn. Cassini also con­firmed the ex­is­tence of liq­uid hy­dro­car­bon lakes on Ti­tan’s sur­face, while grav­ity mea­sure­ments dur­ing close en­coun­ters sug­gested liq­uid wa­ter oceans on both Ti­tan and Dione.

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