( ( ( ( ( X-rays ( Light ( ( the ( ( Way ( to ( Black ( Holes Black ) ) ) ) ( holes ( and ( neutron stars ) ) ) ) ) ( can ( live alone ) ) ) ) ) , ) but ) ( often ( they ( have ( a companion ) ) ) ) ) . )
(ROOT (S (S (NP (NNS X-rays)) (VP (VBD Light) (SBAR (S (NP (DT the) (NAC (NN Way) (PP (TO to) (NP (NNP Black) (NNPS Holes) (NNP Black)))) (NNS holes) (CC and) (NN neutron) (NN stars)) (VP (MD can) (VP (VB live) (ADVP (RB alone)))))))) (, ,) (CC but) (S (ADVP (RB often)) (NP (PRP they)) (VP (VBP have) (NP (DT a) (NN companion)))) (. .)))
X-rays Light the Way to Black Holes Black holes and neutron stars can live alone, but often they have a companion.
(ROOT (S (NP (NP (DT The) (JJ tidal) (NNS forces)) (PP (IN near) (NP (JJ black) (NNS holes)))) (VP (VBP are) (ADJP (RB so) (JJ great) (SBAR (S (NP (PRP they)) (VP (MD can) (ADVP (RB actually)) (VP (VB tear) (NP (NN matter)) (PP (IN from) (NP (DT a) (NN companion) (NN star))))))))) (. .)))