( ( ( ( ( ( The Sun ) ( is ( the ( brightest ( celestial object ) ) ) ) ) , ) and ) ( ( ( an instrument ) ( of ( modest size ) ) ) ( can ( ( carry out ) ( important ( observation research ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NNP Sun)) (VP (VBZ is) (NP (DT the) (JJS brightest) (JJ celestial) (NN object)))) (, ,) (CC and) (S (NP (NP (DT an) (NN instrument)) (PP (IN of) (NP (JJ modest) (NN size)))) (VP (MD can) (VP (VB carry) (PRT (RP out)) (NP (JJ important) (NN observation) (NN research))))) (. .)))
The Sun is the brightest celestial object, and an instrument of modest size can carry out important observation research.
(ROOT (S (S (VP (VBG Looking) (ADVP (RB directly)) (PP (IN at) (NP (DT the) (NN sun))))) (VP (MD can) (VP (VB cause) (NP (NN blindness)))) (. .)))