DIoball is a JoJo reference moonball of 
Jupiterball.
She is the closest visible moon of Jupiterball, if you look with a small telescope. She is still very mad because of Jupiterball's strong gravity which creates tital heating making Io the most volcanically active body in the Solar System.
Composition
Ioball is the densest of the Galilean Moons. She is known for its vivid colors, caused by the deposits of multiple sulfer alletropes by its many volcanoes. She contains a large silicate and iron content.
Gallery
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By u/Gowte
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A real life photo of Io for reference
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