( ( The ( Milky ( Way galaxy ) ) ) ( ( ( is ( a starwheel ) ) ( ( ( about 100 ) light-years ) across ) ) . ) )
(ROOT (S (NP (DT The) (NNP Milky) (NNP Way) (NN galaxy)) (VP (VBZ is) (NP (DT a) (NN starwheel)) (ADVP (NP (QP (RB about) (CD 100)) (NNS light-years)) (IN across))) (. .)))
The Milky Way galaxy is a starwheel about 100 light-years across.
(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))))))