( ( In ( addition ( to telescopes ) ) ) ( , ( astronomers ( ( have ( begun ( ( using ( other instruments ) ) ( to ( make observations ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (NN addition)) (PP (TO to) (NP (NNS telescopes))))) (, ,) (NP (NNS astronomers)) (VP (VBP have) (VP (VBN begun) (S (VP (VBG using) (NP (JJ other) (NNS instruments)) (S (VP (TO to) (VP (VB make) (NP (NNS observations))))))))) (. .)))
In addition to telescopes, astronomers have begun using other instruments to make observations.
(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.