(S (S (BASENP (EX There)) (VP (VBP have) (VP (VP (VBN been) (NP (QP (ADVP (IN at) (JJS least)) (NN eight)) (BASENP (JJ major) (NN satellite) (NNS collisions)))) (PP (IN since) (BASENP (NN 1991)))))) (PERIOD .))