The Origin and Astronomical History of Terrestrial Oxygen
The oxygen atoms available to biological processes in the atmosphere and the oceans and (to some extent) in the crust of the present earth have had a complex history. Astronomers, most of whom have an optimistic attitude toward the huge extrapolations and presumptions that are so often necessary on the frontiers of their profession, believe that one can now perceive the dim outlines of that history, although all readily admit that major gaps and uncertainties still exist. Let us sketch the outlines of this subject as it appears today.
KeywordsBurning Dust Silicate Ozone Helium
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