( X-ray ( astronomy ( ( ( can only ) ( be ( ( ( conducted ( from space ) ) , ) ( because ( ( ( Earth 's ) atmosphere ) ( absorbs ( the ( high-energy radiation ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NN X-ray)) (ADVP (RB astronomy)) (VP (MD can) (ADVP (RB only)) (VP (VB be) (VP (VBN conducted) (PP (IN from) (NP (NN space))) (, ,) (SBAR (IN because) (S (NP (NP (NNP Earth) (POS 's)) (NN atmosphere)) (VP (VBZ absorbs) (NP (DT the) (JJ high-energy) (NN radiation)))))))) (. .)))
X-ray astronomy can only be conducted from space, because Earth's atmosphere absorbs the high-energy radiation.
(ROOT (S (NP (NP (NNS Gases)) (PP (JJ such) (IN as) (NP (NN co2) (CC and) (NN methane)))) (VP (MD can) (VP (NN trap) (NP (NP (JJ thermal) (NN energy)) (PP (IN in) (NP (NP (NN earth) (POS 's)) (NN atmosphere)))) (PP (IN before) (S (VP (VBG radiating) (NP (PRP it)) (PP (IN into) (NP (NN space)))))))) (. .)))