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Print Pictures Our Solar System free solar system printables solar system projects Print Solar System Pictures Our

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Print Pictures Our Solar System

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Since its discovery centuries ago, Ganymede has been the target of a great deal of well-deserved attention from the planetary science community. Earth-bound telescopes have gazed at Ganymede's puzzling, icy surface and, in later decades, flyby space missions and spacecraft, circling around Jupiter, have scrutinized Ganymede--trying to solve its numerous mysteries. These observations ultimately unveiled a complicated, icy moon-world, whose bizarre surface showed a strange and puzzling contrast between its two main types of terrain: the dark, extremely ancient and heavily cratered surface terrain, and the much younger--but still ancient--lighter terrain showing a vast array of mysterious grooves and ridges.



The clear indications that Enceladus possesses liquid water, and perhaps life, catapulted the tiny moon into the same mighty league as its sister moons, Europa of Jupiter and Titan of Saturn, as a world that could potentially harbor precious living tidbits.



However, the models become somewhat more complicated when different forms of ice are taken into consideration. The ice floating around in a glass of water is termed Ice I. Ice I is the least dense form of ice, and it is lighter than water. However, at high pressures, like those that exist in crushingly deep subsurface oceans like Ganymede's, the ice crystal structures evolve into something considerably more compact. "It's like finding a better arrangement of shoes in your luggage--the ice molecules become packed together more tightly," Dr. Vance said in his May 1, 2014 statement. Indeed, the ice can become so extremely dense that it is actually heavier than water--and therefore somersaults down to the bottom of the sea. The heaviest, densiest ice of all is believed to exist within Ganymede, and it is called Ice VI.