(S (S (PP (IN On) (NP (BASENP (NNP Tuesday)) (PRN (COMMA ,) (BASENP (NNP February) (NN 10)) (COMMA ,)))) (S (NP (NP (BASENP (DT the) (JJ American) (JJ civilian) (NNS communications) (NN satellite) (NNP Iridium) (NNP 33)) (PRN (COMMA ,) (VP (VBN launched) (PP (IN in) (BASENP (NN 1997)))) (COMMA ,))) (CC and) (NP (BASENP (DT the) (JJ defunct) (JJ Russian) (JJ military) (NNS communications) (NN satellite) (NNP Kosmos-2251)) (PRN (COMMA ,) (VP (VBN launched) (PP (IN in) (BASENP (NN 1993)))) (COMMA ,)))) (VP (VBD collided) (PP (IN over) (BASENP (NNP Siberia)))))) (PERIOD .))