( ( Strong ( gravitational lensing ) ) ( ( drastically ( alters ( ( the shape ) ( of ( ( an object ) ( on ( the sky ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (JJ Strong) (JJ gravitational) (NN lensing)) (VP (ADVP (RB drastically)) (VBZ alters) (NP (NP (DT the) (NN shape)) (PP (IN of) (NP (NP (DT an) (NN object)) (PP (IN on) (NP (DT the) (NN sky))))))) (: ;)))
Strong gravitational lensing drastically alters the shape of an object on the sky;
(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))))))))) (. .)))