Observations and thermal models of the first interstellar visitor 1I/‘Oumuamua show that ices could have survived a long interstellar journey, suggesting the possibility that ‘Oumuamua could be a comet.
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Meech, K.J. Ice can survive an interstellar trip. Nat Astron 2, 112–113 (2018). https://doi.org/10.1038/s41550-018-0382-7
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DOI: https://doi.org/10.1038/s41550-018-0382-7