( Core ( ( In ( ( ( ( ( solar astronomy ) , ) ( ( the ( innermost part ) ) ( of ( the Sun ) ) ) ) , ) ( where ( energy ( is ( generated ( by ( nuclear reactions ) ) ) ) ) ) ) ) . ) )
(ROOT (FRAG (NP (NNP Core)) (PP (IN In) (NP (NP (JJ solar) (NN astronomy)) (, ,) (NP (NP (DT the) (JJ innermost) (NN part)) (PP (IN of) (NP (DT the) (NNP Sun)))) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (NN energy)) (VP (VBZ is) (VP (VBN generated) (PP (IN by) (NP (JJ nuclear) (NNS reactions))))))))) (. .)))
Core In solar astronomy, the innermost part of the Sun, where energy is generated by nuclear reactions.
(ROOT (S (NP (NP (DT The) (JJ innermost) (NN layer)) (PP (IN of) (NP (DT the) (NN sun)))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (DT the) (NN core))))) (. .)))