Their recent birth in rings may explain why moons were not pulverized by comets.
References
Charnoz, S., Salmon, J. & Crida, A. Nature 465, 752-754 (2010).
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Cartwright, J. Mystery of Saturn's midget moons cracked. Nature (2010). https://doi.org/10.1038/news.2010.286
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DOI: https://doi.org/10.1038/news.2010.286
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