( ( ( ( ( Mercury ( is ( ( the ( largest ( celestial body ) ) ) ( of ( ( this type ) ( in ( the ( Solar System ) ) ) ) ) ) ) ) , ) but ) ( ( larger ( iron-rich exoplanets ) ) ( may exist ) ) ) . )
(ROOT (S (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (JJS largest) (JJ celestial) (NN body)) (PP (IN of) (NP (NP (DT this) (NN type)) (PP (IN in) (NP (DT the) (NNP Solar) (NNP System)))))))) (, ,) (CC but) (S (NP (JJR larger) (JJ iron-rich) (NNS exoplanets)) (VP (MD may) (VP (VB exist)))) (. .)))
Mercury is the largest celestial body of this type in the Solar System, but larger iron-rich exoplanets may exist.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN exoplanet)) (VP (VBZ is) (ADVP (RB often)) (VP (VBN discovered) (SBAR (IN because) (S (NP (PRP it)) (VP (VBZ causes) (NP (DT a) (NN star) (S (VP (VP (TO to) (VP (VB move))) (CC or) (VP (TO to) (VP (VB dim))))))))))) (. .)))