The containment of {HEAD ~ the self luminous system} within {TAIL ~ an envelope} which does not pass any radiation prevents the deterioration of nearby organic materials 
within
The containment of { HEAD ~ the self luminous system } within { TAIL ~ an envelope } which does not pass any radiation prevents the deterioration of nearby organic materials
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH