( ( Of course ) ( , ( ( the Sun ) ( ( is ( ( the ( closest star ) ) ( to Earth ) ) ) . ) ) ) )
(ROOT (S (PP (IN Of) (NP (NN course))) (, ,) (NP (DT the) (NNP Sun)) (VP (VBZ is) (NP (NP (DT the) (JJS closest) (NN star)) (PP (TO to) (NP (NNP Earth))))) (. .)))
Of course, the Sun is the closest star to Earth.
(ROOT (S (PP (IN From) (NP (NN earth))) (, ,) (NP (DT the) (NN sun)) (VP (VBZ appears) (NP (NN brighter)) (PP (IN than) (NP (DT any) (JJ other) (NN star))) (SBAR (IN because) (S (NP (DT the) (NN sun)) (VP (VBZ is) (NP (DT the) (JJS closest) (NN star))))))))