( ( In 1936 ) ( Einstein ( ( predicted ( what ( ( an observer ) ( would ( see ( if ( ( ( a ( ( very faint ) object ) ) ( with ( ( a ( strong ( gravitational field ) ) ) ( such ( as ( a ( black hole ) ) ) ) ) ) ) ( passed ( in ( front ( of ( a ( faint star ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (CD 1936))) (NP (NNP Einstein)) (VP (VBD predicted) (SBAR (WHNP (WP what)) (S (NP (DT an) (NN observer)) (VP (MD would) (VP (VB see) (SBAR (IN if) (S (NP (NP (DT a) (ADJP (RB very) (JJ faint)) (NN object)) (PP (IN with) (NP (NP (DT a) (JJ strong) (JJ gravitational) (NN field)) (PP (JJ such) (IN as) (NP (DT a) (JJ black) (NN hole)))))) (VP (VBD passed) (PP (IN in) (NP (NP (NN front)) (PP (IN of) (NP (DT a) (JJ faint) (NN star))))))))))))) (. .)))
In 1936 Einstein predicted what an observer would see if a very faint object with a strong gravitational field such as a black hole passed in front of a faint star.
(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))))))))) (. .)))