( Copernicus ( ( ( placed ( the Sun ) ) ( at ( ( the center ) ( of ( the ( solar system ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Copernicus)) (VP (VBD placed) (NP (DT the) (NNP Sun)) (PP (IN at) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (DT the) (JJ solar) (NN system)))))) (. .)))
Copernicus placed the Sun at the center of the solar system.
(ROOT (S (NP (DT The) (NN sun)) (VP (VBZ is) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (PRP$ our) (JJ solar) (NN system))))) (. .)))
The sun is the center of our solar system.