( ( Mercury ( in fact ) ) ( ( has ( ( the ( darkest surface ) ) ( of ( ( any planet ) ( in ( the ( Solar System ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Mercury)) (PP (IN in) (NP (NN fact)))) (VP (VBZ has) (NP (NP (DT the) (JJ darkest) (NN surface)) (PP (IN of) (NP (NP (DT any) (NN planet)) (PP (IN in) (NP (DT the) (NNP Solar) (NNP System))))))) (. .)))
Mercury in fact has the darkest surface of any planet in the Solar System.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (JJS smallest) (NN planet)) (PP (IN in) (NP (PRP$ our) (JJ solar) (NN system))))) (. .)))