( ( Four ( of these ) ) ( ( are ( ( used ( on ( ( ( ( two instruments ) , ) ( ( ( ( ( the ( UCSD ( Faint ( Object Spectrometer ) ) ) ) ( -LRB- ( FOS -RRB- ) ) ) , ) and ) ( ( the ( Goddard ( High ( Resolution Spectrometer ) ) ) ) ( -LRB- ( GHRS -RRB- ) ) ) ) ) , ) ) ) ( on ( ( the ( Hubble ( Space Telescope ) ) ) ( -LRB- ( HST -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD Four)) (PP (IN of) (NP (DT these)))) (VP (VBP are) (VP (VBN used) (PP (IN on) (NP (NP (CD two) (NNS instruments)) (, ,) (NP (NP (NP (DT the) (NNP UCSD) (NNP Faint) (NNP Object) (NNP Spectrometer)) (PRN (-LRB- -LRB-) (NP (NNP FOS)) (-RRB- -RRB-))) (, ,) (CC and) (NP (NP (DT the) (NNP Goddard) (NNP High) (NNP Resolution) (NNP Spectrometer)) (PRN (-LRB- -LRB-) (NP (NNP GHRS)) (-RRB- -RRB-)))) (, ,))) (PP (IN on) (NP (NP (DT the) (NNP Hubble) (NNP Space) (NNP Telescope)) (PRN (-LRB- -LRB-) (NP (NNP HST)) (-RRB- -RRB-)))))) (. .)))
Four of these are used on two instruments, the UCSD Faint Object Spectrometer (FOS), and the Goddard High Resolution Spectrometer (GHRS), on the Hubble Space Telescope (HST).
(ROOT (S (NP (DT A) (NN telescope)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB make) (S (NP (NP (NNS objects)) (PP (IN in) (NP (NN space)))) (VP (VB appear) (ADVP (RBR closer))))))))) (. .)))
A telescope is used to make objects in space appear closer.