( ( ( Ceres ' ) gravity ) ( ( is negligible ) ; ) )
(ROOT (S (NP (NP (NNP Ceres) (POS ')) (NN gravity)) (VP (VBZ is) (ADJP (JJ negligible))) (: ;)))
Ceres' gravity is negligible;
(ROOT (S (NP (NNP High) (NNP gravity)) (VP (VBZ explains) (NP (NP (DT the) (JJ spherical) (NN shape)) (PP (IN of) (NP (NNS ceres)))) (, ,) (SBAR (IN once) (S (VP (VBD thought) (S (VP (TO to) (VP (VB be) (NP (DT the) (JJS largest) (NN asteroid))))))))) (. .)))