( ( The object ) ( ( is ( ( ( a quasar ) , ) ( ( ( ( ( ( the ( ( most energetic ) subclass ) ) ( of ( objects ( known ( as ( active ( galactic nuclei ) ) ) ) ) ) ) , ) ( ( produced ( by ( ( the ( rapid accretion ) ) ( of matter ) ) ) ) ( by ( a ( central ( supermassive ( black hole ) ) ) ) ) ) ) , ) ( ( changing ( the ( gravitational energy ) ) ) ( to ( ( light energy ) ( that ( can ( be ( visible ( in ( cosmic distances ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN object)) (VP (VBZ is) (NP (NP (DT a) (NN quasar)) (, ,) (NP (NP (DT the) (ADJP (RBS most) (JJ energetic)) (NNS subclass)) (PP (IN of) (NP (NP (NNS objects)) (VP (VBN known) (PP (IN as) (NP (JJ active) (JJ galactic) (NNS nuclei)))))) (, ,) (VP (VBN produced) (PP (IN by) (NP (NP (DT the) (JJ rapid) (NN accretion)) (PP (IN of) (NP (NN matter))))) (PP (IN by) (NP (DT a) (JJ central) (JJ supermassive) (JJ black) (NN hole)))) (, ,) (VP (VBG changing) (NP (DT the) (JJ gravitational) (NN energy)) (PP (TO to) (NP (NP (JJ light) (NN energy)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB be) (ADJP (JJ visible) (PP (IN in) (NP (JJ cosmic) (NNS distances)))))))))))))) (. .)))
The object is a quasar, the most energetic subclass of objects known as active galactic nuclei, produced by the rapid accretion of matter by a central supermassive black hole, changing the gravitational energy to light energy that can be visible in cosmic distances.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (VP (VBN placed) (PP (IN in) (NP (JJ direct) (NN sunlight)))))) (, ,) (NP (DT a) (JJ black) (NN sweater)) (VP (MD will) (VP (VB absorb) (NP (DT the) (ADJP (RBS most) (JJ visible)) (NN light) (NN energy)))) (. .)))