On Monday, August 28, 2017 at 8:30:15 AM UTC-10, Ralph Frost wrote:   
   > [[Mod. note -- This discussion seems more suited for our sister   
   > newsgroup sci.astro.research, so I've set the "Followup-To" header   
   > to point there.  Please conduct any further discussion in this thread   
   > over in that newsgroup (where readers are more likely to be knowledgable   
   > about astronomical spectral-line physics) than here.   
   > -- jt]]   
   >   
   > Question:  Is the spectral line signal for hydrogen different for   
   > hydrogen in hydrogen gas compared with hydrogen in water?   
   >   
   > Or, if one where observing the spectral line for some distant   
   > collection of hydrogen gas and then that gas reacted with some   
   > sudden supply of oxygen forming water, would or does the spectral   
   > signal change?   
   >   
   > Thanks, in advance.   
   > Ralph Frost   
      
   Cold water does not emit much light. Hot water dissociates   
   into elements. The absorption spectrum of water is not like hydrogen.   
      
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