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Keywords: volcano, Moon, corona
![Таинственный темный спутник Урана Умбриэль](https://images.astronet.ru/pubd/2002/08/24/0001179267/umbriel_vg2_big.preview.gif)
7.04.1996
Why is Umbriel so dark? This dark moon reflects only half the light of other Uranus' moons such as Ariel. And what is that bright ring at the top? Unfortunately, nobody yet knows. These questions presented themselves when Voyager 2 passed this satellite of Uranus in January 1986.
![Новый активный вулкан на спутнике Юпитера Ио](https://images.astronet.ru/pubd/2001/10/23/0001171888/IoNewVolcano_galileo.preview.jpg)
16.10.2001
Would a volcano plume discovered in January above Jupiter's Moon Io still be active months later? To answer this question, the robot spacecraft Galileo currently in orbit around Jupiter was maneuvered to image the plume site during its recent flyby of Io in August.
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