( ( Visualise ( ( the heart ) ( of ( a ( neutron star ) ) ) ) ) ( , ( ( a black ) ( ( ( ( hole , ) ( ( a force ) ( of ( great attraction ) ) ) ) . ) -RRB- ) ) ) )
(ROOT (S (S (VP (VB Visualise) (NP (NP (DT the) (NN heart)) (PP (IN of) (NP (DT a) (NN neutron) (NN star)))))) (, ,) (NP (DT a) (JJ black)) (VP (VP (VBP hole)) (, ,) (NP (NP (DT a) (NN force)) (PP (IN of) (NP (JJ great) (NN attraction))))) (. .) (-RRB- -RRB-)))
Visualise the heart of a neutron star, a black hole, a force of great attraction.)
(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))))))))) (. .)))