( ( ( ( Galaxies and ) clusters ) ( of galaxies ) ) ( ( are ( ( supported ( against ( further collapse ) ) ) ( by ( ( the ( orbital motion ) ) ( of ( ( ( ( the stars ) ( in ( the galaxies ) ) ) and ) ( ( the galaxies ) ( in ( ( the clusters ) ( of galaxies ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Galaxies) (CC and) (NNS clusters)) (PP (IN of) (NP (NNS galaxies)))) (VP (VBP are) (VP (VBN supported) (PP (IN against) (NP (JJ further) (NN collapse))) (PP (IN by) (NP (NP (DT the) (JJ orbital) (NN motion)) (PP (IN of) (NP (NP (NP (DT the) (NNS stars)) (PP (IN in) (NP (DT the) (NNS galaxies)))) (CC and) (NP (NP (DT the) (NNS galaxies)) (PP (IN in) (NP (NP (DT the) (NNS clusters)) (PP (IN of) (NP (NNS galaxies)))))))))))) (. .)))
Galaxies and clusters of galaxies are supported against further collapse by the orbital motion of the stars in the galaxies and the galaxies in the clusters of galaxies.
(ROOT (S (NP (DT A) (NN galaxy)) (VP (VBZ is) (VP (RBS best) (VBN described) (PP (IN as) (NP (NP (DT a) (NN cluster)) (PP (IN of) (NP (NP (NNS billions)) (PP (IN of) (NP (NNS stars))))))))) (. .)))