(S (S (S (NP (BASENP (NNS Scientists)) (PP (IN at) (BASENP (NNP NASA)))) (VP (VBP say) (SBAR (IN that) (S (NP (NP (BASENP (JJ new) (NN satellite) (NNS images)) (PP (IN of) (NP (NP (BASENP (NNP Saturn) (POS 's)) (NN moon)) (BASENP (NNP Enceladus))))) (VP (VBN taken) (PP (IN in) (BASENP (NN 2005))))) (COMMA ,) (VP (VBZ has) (VP (VBN shown) (SBAR (SBAR (IN that) (S (BASENP (DT the) (NN moon)) (VP (VBZ has) (VP (VBN begun) (S (VP (TO to) (VP (VB spew) (NP (BASENP (NNS geysers)) (SBAR (WHNP (WDT which)) (S (VP (VBP contain) (BASENP (NN liquid) (NN water))))))))))))) (CONJP (COMMA ,) (CC and)) (SBAR (IN that) (S (NP (BASENP (DT the) (JJ internal) (NN heat)) (VP (VBN produced) (PP (IN by) (NP (BASENP (DT the) (NN moon) (POS 's)) (NN core))))) (VP (MD may) (VP (VB be) (ADJP (JJ able) (S (VP (TO to) (VP (VP (VB host) (BASENP (NN life))) (PP (IN below) (BASENP (DT the) (JJ icy) (NN surface)))))))))))))))))) (CONJP (COMMA ,) (CC but)) (S (BASENP (NNS scientists)) (VP (ADVP (RB also)) (VP (VBP stress) (SBAR (IN that) (S (BASENP (NN life)) (VP (VP (VBZ has) (RB not)) (VP (ADVP (RB yet)) (VP (VBN been) (VP (VBN found) (PP (IN on) (BASENP (DT the) (NN moon))))))))))))) (PERIOD .))