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Phosphine gas in Venus

Phosphine could originate from unknown photochemistry or geochemistry, or, by analogy with biological production of PH3 on Earth, from the presence of life . The presence of PH3 is unexplained after exhaustive study of steady-state chemistry and photochemical pathways, with no currently known abiotic production routes in Venus’s atmosphere, clouds, surface and subsurface, or from lightning, volcanic or meteoritic delivery and Measurements of trace gases in planetary atmospheres help us explore chemical conditions different to those on Earth . Why Venus of interest to humans in the 21st century ?

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