The composition of Venus’s atmosphere is well known, and is likely being replenished by volcanic gases. Analysis suggests that the volcanic eruptions are water-poor — implying that the planet’s mantle is dry. This is consistent with Venus having had a long-lasting dry surface and never having been habitable.
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References
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This is a summary of: Constantinou, T. et al. A dry Venusian interior constrained by atmospheric chemistry. Nat. Astron. https://doi.org/10.1038/s41550-024-02414-5 (2024).
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A dry interior for Venus suggests the planet was never habitable. Nat Astron (2024). https://doi.org/10.1038/s41550-024-02415-4
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DOI: https://doi.org/10.1038/s41550-024-02415-4
