( ( Comet ( ( ( A ( small body ) ) , ) ( of ( ( ( mostly ( ( ice and ) dust ) ) , ) ( in ( ( ( orbit ( around ( the Sun ) ) ) or ) ( passing ( through ( ( the ( solar system ) ) ( in ( large orbits ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Comet) (NP (NP (DT A) (JJ small) (NN body)) (, ,) (PP (IN of) (NP (NP (RB mostly) (NN ice) (CC and) (NN dust)) (, ,) (PP (IN in) (S (VP (VP (VBG orbit) (PP (IN around) (NP (DT the) (NNP Sun)))) (CC or) (VP (VBG passing) (PP (IN through) (NP (NP (DT the) (JJ solar) (NN system)) (PP (IN in) (NP (JJ large) (NNS orbits))))))))))))) (. .)))
Comet A small body, of mostly ice and dust, in orbit around the Sun or passing through the solar system in large orbits.
(ROOT (S (NP (NP (DT The) (JJS largest) (NN body)) (PP (IN in) (NP (PRP$ our) (JJ solar) (NN system)))) (VP (VBZ is) (NP (DT the) (NN sun))) (. .)))