( Jupiter ( ( is ( ( the ( most ( massive planet ) ) ) ( in ( the ( solar system ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Jupiter)) (VP (VBZ is) (NP (NP (DT the) (RBS most) (JJ massive) (NN planet)) (PP (IN in) (NP (DT the) (JJ solar) (NN system))))) (. .)))
Jupiter is the most  massive planet in the solar system.
(ROOT (S (NP (NNP Jupiter)) (VP (VBZ is) (NP (NP (DT the) (JJS largest) (NN planet)) (PP (IN in) (NP (PRP$ our) (JJ solar) (NN system))))) (. .)))