According to the latest study, our witnessing of the volcanic splendour of Jupiter's moon Io might just be a lucky circumstance. The odds are that the satellite will become quiescent on its escape from orbital custody.
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Schubert, G. Io's escape. Nature 459, 920–921 (2009). https://doi.org/10.1038/459920a
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DOI: https://doi.org/10.1038/459920a