( This ( ( ( ( brought it ) ( from ( ( an orbit ) ( ( 21 miles ) ( high ( to ( a ( slow-motion ( crash landing ) ) ) ) ) ) ) ) ) ( on ( ( the ( nearly ( gravity-free surface ) ) ) ( of ( the ( hourglass-shaped asteroid ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBD brought) (NP (PRP it)) (PP (IN from) (NP (NP (DT an) (NN orbit)) (ADVP (NP (CD 21) (NNS miles)) (JJ high) (PP (TO to) (NP (DT a) (JJ slow-motion) (NN crash) (NN landing)))))) (PP (IN on) (NP (NP (DT the) (RB nearly) (JJ gravity-free) (NN surface)) (PP (IN of) (NP (DT the) (JJ hourglass-shaped) (NN asteroid)))))) (. .)))
This brought it from an orbit 21 miles high to a slow-motion crash landing on the nearly gravity-free surface of the hourglass-shaped asteroid.
(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))))))))) (. .)))