( ( Mercury ( -LRB- ( ( ( 0.4 AU ) ( from ( the Sun ) ) ) -RRB- ) ) ) ( ( is ( ( ( ( the ( closest planet ) ) ( to ( the Sun ) ) ) and ) ( ( the ( smallest planet ) ) ( in ( ( the ( Solar System ) ) ( -LRB- ( ( 0.055 ( Earth masses ) ) -RRB- ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Mercury)) (PRN (-LRB- -LRB-) (NP (NP (CD 0.4) (NN AU)) (PP (IN from) (NP (DT the) (NNP Sun)))) (-RRB- -RRB-))) (VP (VBZ is) (NP (NP (NP (DT the) (JJS closest) (NN planet)) (PP (TO to) (NP (DT the) (NNP Sun)))) (CC and) (NP (NP (DT the) (JJS smallest) (NN planet)) (PP (IN in) (NP (NP (DT the) (NNP Solar) (NNP System)) (PRN (-LRB- -LRB-) (NP (CD 0.055) (NNP Earth) (NNS masses)) (-RRB- -RRB-))))))) (. .)))
Mercury (0.4 AU from the Sun) is the closest planet to the Sun and the smallest planet in the Solar System (0.055 Earth masses).
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (NP (DT the) (JJS smallest) (NN planet)) (PP (IN in) (NP (NP (PRP$ our) (JJ solar) (NN system)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB also)) (NP (NP (JJS nearest)) (PP (TO to) (NP (DT the) (NN sun))))))))))))) (. .)))