Sol/Ganymede
Appearance

Ganymede is the largest moon of Jupiter and the largest moon in Sol. It has a bigger diameter than Mercury, but half its mass. It was first discovered by Galileo Galilei in 1610.[1]
Beneath the frozen surface of Ganymede is a saltwater ocean which could be habitable to life. It contains more water than all oceans on Earth.[2]
References
Gallery
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Ganymede - ED Beyond
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Ganymede - ED Horizons