Uranus
Uranus
is quite cool, with little heat left from gravitational collapse. Minor
differences in heating occasionally start weak storm systems in its
atmosphere. There is no heating of the surrounding moons except through
tidal interactions. None of Uranus’ moons is massive enough to retain a
significant atmosphere.
Ariel
The moon Ariel seems to be
an anomaly. It is significantly larger than its small mass would
indicate, suggesting a hollowed structure rather than solid. It also has
a lower albedo than most moons. This was discovered fairly recently
from telescopic observations from the Saturn system.
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