Aspects of this topic are discussed in the following places at Britannica.
Jupiters-moon-Ganymede-a-natural-colour-view-derived-from-imagesJupiter’s moon Ganymede, a natural-colour view derived from images taken by the Galileo spacecraft …[Credits : Photo NASA/JPL/Caltech (NASA photo # PIA00716)]
Portion-of-Ganymedes-icy-surface-showing-characteristic-dark-and-lightPortion of Ganymede’s icy surface showing characteristic dark and light grooved terrain, as …[Credits : NASA/JPL]
Four-impact-craters-of-the-same-size-imaged-by-spacecraftFour impact craters of the same size (30 km [20 miles] in diameter) imaged by spacecraft on …[Credits : (Venus and Moon) Robert Herrick/Lunar and Planetary Institute; (Mars) Calvin Hamilton/Los Alamos …]
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