(S (S (NP (BASENP (NNS Scientists)) (VP (VBG studying) (NP (BASENP (NN data)) (PP (IN from) (BASENP (DT the) (NNP Chandra) (NN X-ray) (NN telescope)))))) (VP (VBP have) (VP (VBN found) (NP (BASENP (JJ strong) (NN evidence)) (PP (IN for) (NP (BASENP (DT the) (JJ missing) (NN half)) (PP (IN of) (NP (BASENP (JJ ordinary) (NN matter)) (PP (IN in) (BASENP (DT the) (NN universe))))))))))) (PERIOD .))