( ( ( ( The ( Planet ( Mercury Learn ) ) ) ( all ( about ( the planet ) ) ) ) ( ( Mercury , ) ( ( the ( closest planet ) ) ( to ( the Sun ) ) ) ) ) . )
(ROOT (NP (NP (DT The) (NNP Planet) (NNP Mercury) (NNP Learn)) (NP (NP (DT all)) (PP (IN about) (NP (DT the) (NN planet)))) (NP (NP (NNP Mercury)) (, ,) (NP (NP (DT the) (JJS closest) (NN planet)) (PP (TO to) (NP (DT the) (NNP Sun))))) (. .)))
The Planet Mercury Learn all about the planet Mercury, the closest planet to the Sun.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (ADJP (ADJP (JJS closest)) (PP (TO to) (NP (DT the) (NN sun))))) (. .)))