( ( ( ( ( ( Later spectroscopy ) ( ( hinted ( at ( ( the presence ) ( of hydrogen ) ) ) ) ( in ( ( the ( Sun 's ) ) atmosphere ) ) ) ) , ) and ) ( ( the ( German ( astronomer ( Albrecht Unsoeld ) ) ) ) ( ( suggested ( in 1928 ) ) ( that ( ( ( ( hydrogen , ) ( in fact ) ) , ) ( was ( the ( ( most common ) element ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (RB Later) (NN spectroscopy)) (VP (VBD hinted) (PP (IN at) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (NN hydrogen))))) (PP (IN in) (NP (NP (DT the) (NNP Sun) (POS 's)) (NN atmosphere))))) (, ,) (CC and) (S (NP (DT the) (JJ German) (NN astronomer) (NNP Albrecht) (NNP Unsoeld)) (VP (VBD suggested) (PP (IN in) (NP (CD 1928))) (SBAR (IN that) (S (NP (NP (NN hydrogen)) (, ,) (PP (IN in) (NP (NN fact))) (, ,)) (VP (VBD was) (NP (DT the) (ADJP (RBS most) (JJ common)) (NN element))))))) (. .)))
Later spectroscopy hinted at the presence of hydrogen in the Sun's atmosphere, and the German astronomer Albrecht Unsoeld suggested in 1928 that hydrogen, in fact, was the most common element.
(ROOT (S (NP (DT The) (NN sun)) (ADVP (RB mostly)) (VP (VBD made) (PRT (RP up)) (PP (IN of) (NP (DT the) (NN element) (NN hydrogen)))) (. .)))