Save for the gaseous worlds Jupiter, Saturn, Uranus and Neptune, if Ganymede was a planet, it would rank fourth sizewise, right after Earth, Venus and Mars.
It’s got a volumous compound mantle of rock under and ice above.
The Icy greyish/brownish crust shows dark and light areas where water and carbon dioxide ice are present. The dark areas are predominantly filled with impact craters.
MEADE 14” LX200, SBIG ST4020. Exposure time: 0.2 seconds in high resolution.
Image development in CCDops, Maxim DL4 and Adobe Photoshop CS4 Extended
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