(S (S (NP (BASENP (DT An) (NN expert)) (PP (IN at) (NP (NP (BASENP (NNP NASA) (POS 's)) (BASENP (NNP Jet) (NNP Propulsion) (NNP Laboratory))) (PP (IN in) (NP (BASENP (NNP Pasadena)) (COMMA ,) (BASENP (NNP California))))))) (VP (VBD said) (SBAR (S (BASENP (PRP it)) (VP (VBD was) (NP (NP (BASENP (DT the) (JJS closest) (NN approach)) (PP (IN by) (BASENP (PDT such) (DT a) (JJ massive) (NN object)))) (PP (IN for) (NP (BASENP (QP (RB over) (NN 80)) (NNS years)) (COLON -) (PP (IN since) (BASENP (NN 1925))))))))))) (PERIOD .))