(S (S (NP (BASENP (NNP Dr) (NNP David) (NNP Asher)) (PP (IN from) (NP (BASENP (DT the) (NNP Armagh) (NNP Observatory)) (PP (IN in) (BASENP (NNP Northern) (NNP Ireland)))))) (VP (VBD said) (SBAR (S (SBAR (IN if) (S (NP (BASENP (DT the) (NN rock)) (PRN (COMMA ,) (VP (VBN discovered) (PP (IN in) (BASENP (NN 2004)))) (COMMA ,))) (VP (VBD were) (S (VP (TO to) (VP (VB hit) (BASENP (DT the) (NNP Earth)))))))) (S (BASENP (DT the) (NN result)) (VP (MD would) (VP (VB be) (ADJP (JJ devastating))))))))) (PERIOD .))