( ( In ( a ( similar manner ) ) ) ( , ( ( ( ( ( ( even photons ) ( -LRB- ( ( light quanta ) -RRB- ) ) ) , ) ( if ( ( trapped ( in ( a ( container space ) ) ) ) ( -LRB- ( ( as ( ( ( a ( photon gas ) ) or ) ( thermal radiation ) ) ) -RRB- ) ) ) ) ) , ) ( ( would ( contribute ( ( a mass ) ( ( associated ( with ( their energy ) ) ) ( to ( the container ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT a) (JJ similar) (NN manner))) (, ,) (NP (NP (RB even) (NNS photons)) (PRN (-LRB- -LRB-) (NP (JJ light) (NN quanta)) (-RRB- -RRB-)) (, ,) (SBAR (IN if) (S (VP (VBN trapped) (PP (IN in) (NP (DT a) (NN container) (NN space))) (PRN (-LRB- -LRB-) (PP (IN as) (NP (NP (DT a) (NN photon) (NN gas)) (CC or) (NP (JJ thermal) (NN radiation)))) (-RRB- -RRB-))))) (, ,)) (VP (MD would) (VP (VB contribute) (NP (NP (DT a) (NN mass)) (VP (VBN associated) (PP (IN with) (NP (PRP$ their) (NN energy))) (PP (TO to) (NP (DT the) (NN container))))))) (. .)))
In a similar manner, even photons (light quanta), if trapped in a container space (as a photon gas or thermal radiation), would contribute a mass associated with their energy to the container.
(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)))))))) (. .)))