Hi,
A paper published today reports the finding of molecular oxygen on a comet and monitoring over several month suggests the oxygen is part of the material comprising the comet and not the product of solar radiation decomposing water. I presume this will have implications for the formation of the solar system and possibly the early Earth. I'll read the article in full tonight; meanwhile I absolutely
looove their mass spectrum!
http://www.abc.net.au/news/2015-10-2...oxygen/6892708
http://www.nature.com/nature/journal...ture15707.html