( Now ( , ( ( ( ( two amateur ) and ) ( two ( professional astronomers ) ) ) ( ( have ( ( ( dispelled ( ( the concerns ) ( about ( ( potentially hazardous ) ( asteroid ( 1999 ( AN10 colliding ) ) ) ) ) ) ) ( with ( ( planet Earth ) ( in ( 40 years ) ) ) ) ) time ) ) . ) ) ) )
(ROOT (S (ADVP (RB Now)) (, ,) (NP (NP (CD two) (NNS amateur)) (CC and) (NP (CD two) (JJ professional) (NNS astronomers))) (VP (VBP have) (VP (VBD dispelled) (NP (NP (DT the) (NNS concerns)) (PP (IN about) (NP (ADJP (RB potentially) (JJ hazardous)) (JJ asteroid) (CD 1999) (NN AN10) (NN colliding)))) (PP (IN with) (NP (NP (NN planet) (NN Earth)) (PP (IN in) (NP (CD 40) (NNS years))))) (NP (NN time)))) (. .)))
Now, two amateur and two professional astronomers have dispelled the concerns about potentially hazardous asteroid 1999 AN10 colliding with planet Earth in 40 years time.
(ROOT (S (PP (IN In) (NP (DT the) (NN past))) (, ,) (NP (NP (NNS asteroids)) (VP (VBG colliding) (PP (IN with) (NP (NN planet) (NN earth))))) (VP (VBZ has) (VP (VBN caused) (NP (JJ many) (NNS organisms)) (S (VP (TO to) (VP (VB die) (PRT (RP off))))))) (. .)))