It has been known for some years that Jupiter's satellite Io has sodium as a component of its atmosphere. The source, it now seems, is sodium chloride emitted by volcanoes on Io's surface.
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Hunten, D. Sodium at Io. Nature 421, 30–31 (2003). https://doi.org/10.1038/421030a
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DOI: https://doi.org/10.1038/421030a
