( ( ( The distribution ) ( of ( the gas ) ) ) ( itself ( ( ( ( does n't ) ( alter ( the ( gravitational field ) ) ) ) . ) -RRB- ) ) )
(ROOT (S (NP (NP (DT The) (NN distribution)) (PP (IN of) (NP (DT the) (NN gas)))) (ADVP (PRP itself)) (VP (VBZ does) (RB n't) (VP (VB alter) (NP (DT the) (JJ gravitational) (NN field)))) (. .) (-RRB- -RRB-)))
The distribution of the gas itself doesn't alter the gravitational field.)
(ROOT (S (NP (JJ Strong) (JJ gravitational) (NNS fields)) (VP (VBP are) (ADJP (JJ capable) (PP (IN of) (S (VP (VBG altering) (NP (NP (DT the) (NN rate)) (PP (IN of) (NP (NN time) (NN passing))))))))) (. .)))