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Ariel is similar in size and mass to Umbriel, but whereas Umbriel is the darkest of Uranus' five largest Unlike the other gas giants, Uranus reveals few atmospheric features in visible light. However, latitudinal atmospheric bands do exist, as can be seen in the enhanced image on the right; because Uranus has such an inclined axis of rotation (which is pointing almost directly down into this image), atmospheric bands that cross the surface of the planet (in the same way that atmospheric bands cross Jupiter's surface) appear as concentric circles in the photo. U.S. National Aeronautics and Space Administration (NASA).

satellites, Ariel is the brightest, with a 0.40 average albedo. Ariel's surface seems to have evolved more like Titania's surface than that of Umbriel; it shows global-scale faulting (canyons, scarps, and lineaments) and resurfacing by cryovolcanism, but on a more extensive scale than occurred on Titania. Ariel's most heavily cratered plains show less cratering than the most cratered units on Titania and Oberon. Evidence has been found for the extrusion of ice into Ariel's surface, filling part of a valley and partially burying an impact crater.

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Science EncyclopediaScience & Philosophy: Two-envelope paradox to VenusUranus - Observations From Earth, Results From The Flyby Of The Voyager 2 Spacecraft, Uranus's Magnetic Field - Discovery, Puck