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Mysterious interstellar visitor is a comet — not an asteroid
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doi: https://doi.org/10.1038/d41586-018-05552-9
References
Micheli, M. et al. Nature https://doi.org/10.1038/s41586-018-0254-4 (2018).
Fitzsimmons, A. et al. Nature Astron. 2, 133–137 (2018).
Meech, K. J. Nature 552, 378–381 (2017).