(S (S (S (BASENP (DT The) (NNS planets)) (VP (VBP are) (ADJP (ADJP (ADVP (RB too)) (ADJP (RB far) (JJ away))) (SBAR (S (VP (TO to) (VP (VB be) (VP (VP (VBN observed) (ADVP (RB directly))) (PP (IN with) (BASENP (JJ current) (NN technology))))))))))) (CONJP (COMMA ,) (CC but)) (S (PP (IN by) (S (S (S (VP (VBG measuring) (NP (BASENP (DT the) (NNS spectra)) (PP (IN of) (BASENP (DT each) (NN planet)))))) (SBAR (WHADVP (WRB when)) (S (ADJP (JJ visible) (PP (IN with) (BASENP (PRPD its) (NN star))))))) (CONJP (COMMA ,) (CC and)) (S (S (ADVP (RB again))) (SBAR (WHADVP (WRB when)) (S (BASENP (DT the) (NN planet)) (VP (VBD was) (VP (VBN hidden) (PP (IN behind) (BASENP (PRPD its) (NN star)))))))))) (COMMA ,) (S (BASENP (DT the) (NNS teams)) (VP (VBD were) (ADJP (JJ able) (S (VP (TO to) (VP (VB determine) (NP (BASENP (DT the) (NNS measurements)) (PP (IN of) (BASENP (DT the) (NNS planets) (NNS spectra)))))))))))) (PERIOD .))