(S (S (BASENP (NNS Scientists)) (VP (VBD had) (NP (NP (DT a) (NP (NP (BASENP (NN 1)) (PP (IN in) (BASENP (NN 2,000)))) (NN chance))) (PP (IN of) (S (VP (VBG discovering) (BASENP (DT the) (NN planet)))))))) (PERIOD .))