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Acceleration of 1I/'Oumuamua from radiolytically produced H2 in H2O ice - Nature
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In 2017, 1I/'Oumuamua was identified as the first known interstellar object in the Solar System1. Although typical cometary activity tracers were not detected2–6, 'Oumuamua showed a notable non-gravitational acceleration7. So far, there has been no explanation that can reconcile these constraints8. Owing to energetic considerations, outgassing of hyper-volatile molecules is favoured over heavier volatiles such as H2O and CO2 (ref. 9).
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