Ko Umbriel ko te tuatoru nui rawa, me te tuawha tino nui o Uranian moon. Ko te kiato o te marama, ko te 1.39 g / cm3, e tohu ana ko te nuinga o te reira i roto i te wai huka, ki te pūhui kiato kore-huka hanga a tawhio noa 40% o tona papatipu. Ka taea e te whakamutunga kia hanga o te toka, me te rauemi carbonaceous tae atu pūhui organic taimaha mohiotia rite tholins. tautoko te aroaro o te wai huka e infrared kitenga spectroscopic, i whakakitea wai tioata i runga i te mata o te marama. he kaha ake i runga i te haurua ārahi o Umbriel o te wai huka i runga i te haurua ārahi o te huka. e kore e mohiotia te take o tenei rite te ōwehenga, engari kia kia pā ana ki te bombardment e te pānga i te reira i roto i te matūriki i te magnetosphere o Uranus, i te mea he kaha i runga i te haurua ārahi o te marama.
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