(S (S (PP (IN In) (BASENP (NN 2008))) (COMMA ,) (S (BASENP (NNP Cassini)) (VP (VBD discovered) (NP (BASENP (DT a) (JJ high) (QT (DQL ``) (NP (NP (BASENP (NN density)) (PP (IN of) (NP (NP (NP (NP (BASENP (JJ volatile) (NNS gases)) (COMMA ,) (BASENP (NN water) (NN vapor))) (COMMA ,) (BASENP (NN carbon) (NN dioxide))) (CC and) (BASENP (NN carbon) (NN monoxide))) (CONJP (COMMA ,) (CONJP (ADVP (RB as) (RB well)) (IN as))) (BASENP (JJ organic) (NNS materials))))) (COMMA ,) (ADJP (ADJP (BASENP (QP (DT some) (NN 20)) (NNS times)) (JJR denser)) (PP (IN than) (VP (VBD expected))))) (DQR ''))) (PP (IN in) (NP (BASENP (NNS geysers)) (VP (VBG erupting) (PP (IN from) (BASENP (DT the) (NN moon)))))))))) (PERIOD .))