( ( Some astronomers ) ( ( ( focus ( their research ) ) ( on ( ( ( objects ( in ( our ( solar system ) ) ) ) , ) ( such ( as ( ( ( the sun ) or ) planets ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT Some) (NNS astronomers)) (VP (VBP focus) (NP (PRP$ their) (NN research)) (PP (IN on) (NP (NP (NNS objects)) (PP (IN in) (NP (PRP$ our) (JJ solar) (NN system))) (, ,) (PP (JJ such) (IN as) (NP (NP (DT the) (NN sun)) (CC or) (NP (NNS planets))))))) (. .)))
Some astronomers focus their research on objects in our solar system, such as the sun or planets.
(ROOT (S (NP (NP (RB Only) (DT the) (NN sun)) (PP (IN in) (NP (PRP$ our) (JJ solar) (NN system)))) (VP (VBP give) (PRT (RP off)) (NP (PRP$ their) (JJ own) (NN light))) (. .)))
Only the sun in our solar system give off their own light.