Diagram of the proposed Venus mesospheric water cycle mechanism to sustain the observed HDO and H 2 O VMR and HDO/H 2 O ratio increase with altitude. Thanks to observations by the Solar Occultation in ...
Every molecule of pure “heavy water” contains two atoms of deuterium, which is hydrogen of the double-weight form identified in 1931 by Columbia’s Harold Clayton Urey. Deuterium is not rare in nature.
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