Surface features

Surface features - Surface features Voyager 2 image mosaic...

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Surface features Voyager 2 image mosaic of Ganymede's anti-Jovian hemisphere. The ancient dark area of Galileo Regio lies at the upper right. It is separated from the smaller dark region of Marius Regio to its left by the brighter and younger band of Uruk Sulcus . Fresh ice ejected from the relatively recent Osiris Crater created the bright rays at the bottom. Depiction of Ganymede centered over 45° W. longitude. The upper and lower dark areas are Perrine and Nicholson regions; the bright-rayed craters are Tros (upper right) and Cisti (lower left). The Ganymedian surface is a mix of two types of terrain: very old, highly cratered , dark regions and somewhat younger (but still ancient), lighter regions marked with an extensive array of grooves and ridges. The dark terrain, which comprises about one-third of the surface, [43] contains clays and organic materials that could indicate the composition of the impactors from which Jovian satellites accreted. [44] The heating mechanism required for the formation of the grooved terrain on Ganymede is an unsolved problem in the planetary sciences . The modern view is that the grooved terrain is mainly tectonic in nature. [5]
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Surface features - Surface features Voyager 2 image mosaic...

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