Hydrogen sulfide gas is detected above Uranus’s main cloud deck, confirming the prevalence of H2S ice particles as the main cloud component and a strongly unbalanced nitrogen/sulfur ratio in the planet's deep atmosphere.
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de Pater, I. Selective enrichment of volatiles confirmed. Nat Astron 2, 364–365 (2018). https://doi.org/10.1038/s41550-018-0457-5
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DOI: https://doi.org/10.1038/s41550-018-0457-5
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