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Why is Enceladus one of the brightest moons of Saturn?
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Saturn
Saturn and its spectacular rings, in a natural-color composite of 126 images taken by the Cassini spacecraft on October 6, 2004. The view is directed toward Saturn's southern hemisphere, which is tipped toward the Sun. Shadows cast by the rings are visible against the bluish northern hemisphere, while the planet's shadow is projected on the rings to the left.
Enceladus is the brightest moon of Saturn because its surface is composed of almost pure water ice, which reflects essentially all of the light that strikes itāa reflectivity greater than that of newly fallen snow.12
This high brightness is maintained by the moon's ongoing geological activity. Enceladus features cryovolcanic eruptions, particularly from tectonic fractures in its south polar region known as "tiger stripes," which eject plumes of water vapour and ice particles into space. These particles resupply Saturnās E ring, a tenuous ring of material that continually coats Enceladus and other inner moons, ensuring their surfaces remain bright.12