Thirty years ago, the spacecraft Pioneer Venus observed the peak and decline of sulphur dioxide levels above Venus's clouds. Similar observations by Venus Express reveal a surprisingly variable venusian atmosphere.
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Esposito, L. Rising sulphur on Venus. Nature Geosci 6, 20–21 (2013). https://doi.org/10.1038/ngeo1675
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DOI: https://doi.org/10.1038/ngeo1675
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