( ( ( ( -LRB- ( ( ( Smith , ) 1992 ) -RRB- ) ) ( The diameter ) ) ( of ( the ( Milky ( Way Galaxy ) ) ) ) ) ( ( is ( 100,000 ( light years ) ) ) . ) )
(ROOT (S (NP (NP (PRN (-LRB- -LRB-) (NP (NNP Smith)) (, ,) (NP (CD 1992)) (-RRB- -RRB-)) (NNP The) (NNP diameter)) (PP (IN of) (NP (DT the) (NNP Milky) (NNP Way) (NNP Galaxy)))) (VP (VBZ is) (NP (CD 100,000) (JJ light) (NNS years))) (. .)))
(Smith, 1992) The diameter of the Milky Way Galaxy is 100,000 light years.
(ROOT (FRAG (S (S (VP (TO To) (VP (VB express) (NP (NP (DT the) (NN distance)) (PP (IN between) (NP (NP (DT the) (JJ milky) (NN way) (NN galaxy)) (CC and) (NP (JJ other) (NNS galaxies)))))))) (, ,) (NP (NP (DT the) (ADJP (RBS most) (JJ appropriate)) (NN unit)) (PP (IN of) (NP (NN measurement)))) (VP (VBZ is) (NP (DT the) (NN light-year))))))