( ( ( The action ) ( of gravity ) ) ( ( has ( ( ( created ( ( ( ( ( spiral , ) elliptical ) , ) and ) ( ( irregular aggregations ) ( of ( ( ( ( ( stars , ) gas ) , ) and ) ( dark matter ) ) ) ) ) ) ( from ( low-amplitude ( density fluctuations ) ) ) ) ( in ( the ( primordial plasma ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN action)) (PP (IN of) (NP (NN gravity)))) (VP (VBZ has) (VP (VBN created) (NP (NP (NN spiral)) (, ,) (NP (JJ elliptical)) (, ,) (CC and) (NP (NP (NN irregular) (NNS aggregations)) (PP (IN of) (NP (NP (NNS stars)) (, ,) (NP (NN gas)) (, ,) (CC and) (NP (JJ dark) (NN matter)))))) (PP (IN from) (NP (JJ low-amplitude) (NN density) (NNS fluctuations))) (PP (IN in) (NP (DT the) (JJ primordial) (NN plasma))))) (. .)))
The action of gravity has created spiral, elliptical, and irregular aggregations of stars, gas, and dark matter from low-amplitude density fluctuations in the primordial plasma.
(ROOT (S (NP (NNS Gases)) (VP (VBP have) (NP (DT the) (JJS lowest) (NN density))) (. .)))