( ( ( Our galaxy ) ( -LRB- ( ( the ( Milky Way ) ) -RRB- ) ) ) ( ( is ( ( ( about 100,000 ) ( light years ) ) ( in diameter ) ) ) . ) )
(ROOT (S (NP (NP (PRP$ Our) (NN galaxy)) (PRN (-LRB- -LRB-) (NP (DT the) (NNP Milky) (NNP Way)) (-RRB- -RRB-))) (VP (VBZ is) (NP (NP (QP (RB about) (CD 100,000)) (JJ light) (NNS years)) (PP (IN in) (NP (NN diameter))))) (. .)))
Our galaxy (the Milky Way) is about 100,000 light years in diameter.
(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))))))