( ( The ( Terrestrial Planets ) ) ( ( -LRB- ( ( Inner Planets ) -RRB- ) ) ( ( The ( terrestrial planets ) ) ( ( are ( ( the ( four ( innermost planets ) ) ) ( in ( ( ( the ( solar system ) ) , ) ( Mercury ( , ( Venus ( , ( ( Earth and ) Mars ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (NP (DT The) (NNP Terrestrial) (NNP Planets)) (PRN (-LRB- -LRB-) (NP (NNP Inner) (NNP Planets)) (-RRB- -RRB-)) (NP (DT The) (JJ terrestrial) (NNS planets)) (VP (VBP are) (NP (NP (DT the) (CD four) (JJ innermost) (NNS planets)) (PP (IN in) (NP (NP (DT the) (JJ solar) (NN system)) (, ,) (NP (NNP Mercury) (, ,) (NNP Venus) (, ,) (NNP Earth) (CC and) (NNP Mars)))))) (. .)))
The Terrestrial Planets (Inner Planets) The terrestrial planets are the four innermost planets in the solar system, Mercury , Venus , Earth and Mars .
(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))))) (. .)))