( They ( ( 'll ( be ( used ( to ( investigate ( ( the ( violent ( space weather ) ) ) ( that ( can ( ( threaten ( satellites ( , ( astronauts ( and ( even ( power grids ) ) ) ) ) ) ) ( on ( ( the ( Earth 's ) ) surface ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (MD 'll) (VP (VB be) (VP (VBN used) (S (VP (TO to) (VP (VB investigate) (NP (NP (DT the) (JJ violent) (NN space) (NN weather)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB threaten) (NP (NNS satellites) (, ,) (NNS astronauts) (CC and) (JJ even) (NN power) (NNS grids)) (PP (IN on) (NP (NP (DT the) (NN Earth) (POS 's)) (NN surface)))))))))))))) (. .)))
They'll be used to investigate the violent space weather that can threaten satellites, astronauts and even power grids on the Earth's surface.
(ROOT (S (NP (NNS Satellites)) (VP (VBP are) (NP (NP (JJ man-made) (NNS devices)) (PP (IN in) (NP (NN space))) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN used) (S (VP (TO to) (VP (VB observe) (NP (NP (DT the) (NN earth) (POS 's)) (NN surface))))))))))) (. .)))